Root 4g speed tweak + potential data problem fixed

[ChiweN]

Hi guys. Many of us have been having issues with 4g not working. Trying to fix the problem, I have been tweaking build.prop and stumbled on something interesting.

First thing I did was remove the 3g turbocharger entries at the bottom of build.prop. I don't know how they got there, I never ran it, I only ran v6 supercharger (they are seperate scripts) after doing this, my 4g appears to be fixed.

Now.. there's two lines in build.prop - ro.ril.hsxpa=1 and ro.ril.gprsclass=10. Using a text editor (I use root explorer to navigate to build.prop, long press it, and choose text editor) I changed ro.ril.hsxpa to 3 and ro.ril.gprsclass to 12 as shown below..

It nearly doubled my 4g speed. I tested after the changes, and reverted them back to 1 and 10 and tested again. I can verify a definite speed increase. Screen below..

4+mbps scores were with the new values. Lower scores are with the original values of 1 and 10. As you can see I alternated between the two a couple times for reliable testing.

Also.. you must be in R/W to edit build.prop or it will not save your changes.


Edit: I forget who's phone was dumped to package the pre-rooted tar file, but my theory is he may have ran 3g turbocharger, and it got carried over to our phone when we Odin'd the pre root tar. There are other things I've found in the system files that carried over from the original phone the tar came from (nfsshift.apk and Tetris.apk). I forget the exact location but ill post it later for you all to find and delete.

 

[rootmyphone]

How to remove the 3g turbocharge thing ?

 

[gitman]

in your screenshot, its not real clear which options are the 3G turbocharger options?

edit:

here's the build.prop that comes in the pre-root image:

# begin build properties
# autogenerated by buildinfo.sh
ro.build.id=GINGERBREAD
ro.build.display.id=GINGERBREAD.EL03
ro.build.version.incremental=EL03
ro.build.version.sdk=10
ro.build.version.codename=REL
ro.build.version.release=2.3.6
ro.build.date=Sat Dec 10 18:39:47 KST 2011
ro.build.date.utc=1323509987
ro.build.type=user
ro.build.user=se.infra
ro.build.host=SEP-51
ro.build.tags=release-keys
ro.product.model=SCH-R920
ro.product.brand=samsung
ro.product.name=SCH-R920
ro.product.device=SCH-R920
ro.product.board=SCH-R920
ro.product.cpu.abi=armeabi-v7a
ro.product.cpu.abi2=armeabi
ro.product.manufacturer=samsung
ro.product.locale.language=en
ro.product.locale.region=US
ro.wifi.channels=
ro.board.platform=s5pc110
# ro.build.product is obsolete; use ro.product.device
ro.build.product=SCH-R920
# Do not try to parse ro.build.description or .fingerprint
ro.build.description=SCH-R920-user 2.3.6 GINGERBREAD EL03 release-keys
ro.build.fingerprint=samsung/SCH-R920/SCH-R920:2.3.6/GINGERBREAD/EL03:user/release-keys
# Samsung Specific Properties
ro.build.PDA=SCH-R920.EL03
ro.build.hidden_ver=
ro.build.changelist=782871
ro.flash.resolution=720
# end build properties
#
# system.prop for smdkc110
#

rild.libpath=/system/lib/libsec-ril40.so
rild.libargs=-d /dev/ttyS0
ro.sf.lcd_density=160
dalvik.vm.heapsize=64m

# Indicate carrier OTA SP number schema
# refer to frameworks/base/telephony/java/com/android/
# internal/telephony/cdma/CDMAPhone.java for the schema:
ro.cdma.otaspnumschema=SELC,3,00,07,80,87,88,99
ro.opengles.version=131072

# Samsung USB default mode
persist.service.usb.setting=2

#
# ADDITIONAL_BUILD_PROPERTIES
#
ro.opengles.version=131072
ro.config.ringtone=S_Over_the_horizon.ogg
ro.config.notification_sound=01_Sherbet.ogg
ro.config.alarm_alert=Good_Morning.ogg
ro.url.legal=http://www.google.com/intl/%s/mobile/android/basic/phone-legal.html
ro.url.legal.android_privacy=http://www.google.com/intl/%s/mobile/android/basic/privacy.html
ro.com.google.locationfeatures=1
ro.setupwizard.mode=DISABLED
ro.com.google.gmsversion=2.3_r8
ro.carrier=MPCS
ro.com.google.clientidbase=android-samsung
ro.com.google.clientidbase.yt=android-samsung
ro.com.google.clientidbase.am=android-samsung
ro.com.google.clientidbase.gmm=android-samsung
ro.com.google.clientidbase.ms=android-metropcs-us
ro.csc.sales_code=MTR
wifi.interface=eth0
wifi.supplicant_scan_interval=15
ro.error.receiver.default=com.samsung.receiver.error
keyguard.no_require_sim=true
ro.com.android.dateformat=MM-dd-yyyy
ro.com.android.dataroaming=false
ro.ril.hsxpa=1
ro.ril.gprsclass=10
ro.config.notification_sound=OnTheHunt.ogg
ro.config.alarm_alert=Alarm_Classic.ogg
media.stagefright.enable-player=false
media.stagefright.enable-meta=false
media.stagefright.enable-scan=false
media.stagefright.enable-http=true
media.stagefright.enable-rtsp=false
dalvik.vm.dexopt-flags=m=y
net.bt.name=Android
dalvik.vm.stack-trace-file=/data/anr/traces.txt

no mention of /(V6 Super|3G Turbo)charger/

edit 2:

ro.ril.hsxpa=1 and ro.ril.gprsclass are both GSM-specific settings, i can't see how it would have an effect on cdma devices

edit 3:

sorry man, didn't intend to take a dump on your thread... you seem pretty excited about it

 

[Tokenpoke]

I confirm that there was no 3g charger attached to my build prop

The other edits DO work. I went from 509kbps to 1.1mbps

 

[ChiweN]

in your screenshot, its not real clear which options are the 3G turbocharger options?

edit:

here's the build.prop that comes in the pre-root image:

# begin build properties
# autogenerated by buildinfo.sh
ro.build.id=GINGERBREAD
ro.build.display.id=GINGERBREAD.EL03
ro.build.version.incremental=EL03
ro.build.version.sdk=10
ro.build.version.codename=REL
ro.build.version.release=2.3.6
ro.build.date=Sat Dec 10 18:39:47 KST 2011
ro.build.date.utc=1323509987
ro.build.type=user
ro.build.user=se.infra
ro.build.host=SEP-51
ro.build.tags=release-keys
ro.product.model=SCH-R920
ro.product.brand=samsung
ro.product.name=SCH-R920
ro.product.device=SCH-R920
ro.product.board=SCH-R920
ro.product.cpu.abi=armeabi-v7a
ro.product.cpu.abi2=armeabi
ro.product.manufacturer=samsung
ro.product.locale.language=en
ro.product.locale.region=US
ro.wifi.channels=
ro.board.platform=s5pc110
# ro.build.product is obsolete; use ro.product.device
ro.build.product=SCH-R920
# Do not try to parse ro.build.description or .fingerprint
ro.build.description=SCH-R920-user 2.3.6 GINGERBREAD EL03 release-keys
ro.build.fingerprint=samsung/SCH-R920/SCH-R920:2.3.6/GINGERBREAD/EL03:user/release-keys
# Samsung Specific Properties
ro.build.PDA=SCH-R920.EL03
ro.build.hidden_ver=
ro.build.changelist=782871
ro.flash.resolution=720
# end build properties
#
# system.prop for smdkc110
#

rild.libpath=/system/lib/libsec-ril40.so
rild.libargs=-d /dev/ttyS0
ro.sf.lcd_density=160
dalvik.vm.heapsize=64m

# Indicate carrier OTA SP number schema
# refer to frameworks/base/telephony/java/com/android/
# internal/telephony/cdma/CDMAPhone.java for the schema:
ro.cdma.otaspnumschema=SELC,3,00,07,80,87,88,99
ro.opengles.version=131072

# Samsung USB default mode
persist.service.usb.setting=2

#
# ADDITIONAL_BUILD_PROPERTIES
#
ro.opengles.version=131072
ro.config.ringtone=S_Over_the_horizon.ogg
ro.config.notification_sound=01_Sherbet.ogg
ro.config.alarm_alert=Good_Morning.ogg
ro.url.legal=http://www.google.com/intl/%s/mobile/android/basic/phone-legal.html
ro.url.legal.android_privacy=http://www.google.com/intl/%s/mobile/android/basic/privacy.html
ro.com.google.locationfeatures=1
ro.setupwizard.mode=DISABLED
ro.com.google.gmsversion=2.3_r8
ro.carrier=MPCS
ro.com.google.clientidbase=android-samsung
ro.com.google.clientidbase.yt=android-samsung
ro.com.google.clientidbase.am=android-samsung
ro.com.google.clientidbase.gmm=android-samsung
ro.com.google.clientidbase.ms=android-metropcs-us
ro.csc.sales_code=MTR
wifi.interface=eth0
wifi.supplicant_scan_interval=15
ro.error.receiver.default=com.samsung.receiver.error
keyguard.no_require_sim=true
ro.com.android.dateformat=MM-dd-yyyy
ro.com.android.dataroaming=false
ro.ril.hsxpa=1
ro.ril.gprsclass=10
ro.config.notification_sound=OnTheHunt.ogg
ro.config.alarm_alert=Alarm_Classic.ogg
media.stagefright.enable-player=false
media.stagefright.enable-meta=false
media.stagefright.enable-scan=false
media.stagefright.enable-http=true
media.stagefright.enable-rtsp=false
dalvik.vm.dexopt-flags=m=y
net.bt.name=Android
dalvik.vm.stack-trace-file=/data/anr/traces.txt

no mention of /(V6 Super|3G Turbo)charger/

edit 2:

ro.ril.hsxpa=1 and ro.ril.gprsclass are both GSM-specific settings, i can't see how it would have an effect on cdma devices

edit 3:

sorry man, didn't intend to take a dump on your thread... you seem pretty excited about it

I'm not excited lol, passing on info, that's what I do. Now that you posted the original (thanks) I see that v6 supercharger did indeed install the 3g turbocharger script.

I didn't post a screen of the 3g script, I had deleted it already. You have to look for it, it resides at the very end of build.prop, easy to spot if you read the comments, about 12 lines. It won't be there if you did not run v6 apparently.

I don't know why changing the values made an impact, but they did. I had read about this tweak a few times in various places.

I did the tests, many times. The results were obvious, and shown in the screen shot. I don't believe it is coincidence, the results were solid each test.

Don't worry about dumping on me lol, if at any time I'm wrong, I'm wrong. I have been tons of times. Just learning :-D

Btw, I don't think I'm wrong on this one.

 

[ChiweN]

I confirm that there was no 3g charger attached to my build prop

The other edits DO work. I went from 509kbps to 1.1mbps

Thanks for giving it a try and confirming it does work mike :-D

Now. With the people that have their 4g hang on them. I wonder how many used the v6 script, which installs 3g turbocharger to the build.prop. it creates a conflict. After deleting the turbocharger entries it completely fixed my 4g issues. No more hangups.

This is what the 3g turbocharger entries look like in the build.prop file. Everyone that has 4g issues.. delete everything in between:

# 3g turbocharger enhancement!

And

# end of v6 supercharged entries.

It WILL fix your 4g issues.

Also, when I get home I'm going to upload my build.prop file, so anyone that doesn't understand how to do these things, or are nervous about it can just overwrite theirs with mine.

 

[Tokenpoke]

Thanks for giving it a try and confirming it does work mike :-D

Now. With the people that have their 4g hang on them. I wonder how many used the v6 script, which installs 3g turbocharger to the build.prop. it creates a conflict. After deleting the turbocharger entries it completely fixed my 4g issues. No more hangups.

This is what the 3g turbocharger entries look like in the build.prop file. Everyone that has 4g issues.. delete everything in between:

# 3g turbocharger enhancement!

And

# end of v6 supercharged entries.

It WILL fix your 4g issues.

Also, when I get home I'm going to upload my build.prop file, so anyone that doesn't understand how to do these things, or are nervous about it can just overwrite theirs with mine.

I actually did run the v6 script but had no 3g stuff in my prop.... Weird.
I also did a factory reset (after removing all metro stuff except for visual voicemail) and got the enhancement fota but it failed and gave a message telling me to have metro take a look at my phone.
Tether works now though.

I did the reset because my status showed the network as evdo when the 4g icon was active. Now it stays on lte

 

[ChiweN]

I actually did run the v6 script but had no 3g stuff in my prop.... Weird.
I also did a factory reset (after removing all metro stuff except for visual voicemail) and got the enhancement fota but it failed and gave a message telling me to have metro take a look at my phone.
Tether works now though.

I did the reset because my status showed the network as evdo when the 4g icon was active. Now it stays on lte

Hmm.. I wonder why the 3g turbocharger was on my phone. I never ran it. Odd.

Yeah, as you know my phone does that too. Do you use anycut to turn 4g off and on? Or have you since the factory reset? If I do the volte trick, my lte comes back. But, if I turn 4g off, when I turn it back on it sticks on evdo, with the 4g icon showing.

 

[Tokenpoke]

Hmm.. I wonder why the 3g turbocharger was on my phone. I never ran it. Odd.

Yeah, as you know my phone does that too. Do you use anycut to turn 4g off and on? Or have you since the factory reset? If I do the volte trick, my lte comes back. But, if I turn 4g off, when I turn it back on it sticks on evdo, with the 4g icon showing.

No i haven't used any shortcuts...

I was also mistaken... My status just showed network as 1x-rtt with the 4g icon showing... Tether still works afaik but i will test again in a couple hours when i get back home.

 

[Goochy]

Ok, I changed the values, rebooted, checked the values and they are now default. Also, I have run v6 and I dont have the 3g turbocharger in my build prop.

Edit 1: deleted the .bak created and values stayed after reboot. speeds varied slightly, not doubling. Also I still have the 4g hang. (mind you, without the 3g TC).

 

[Goochy]

Also, im having trouble noticing a difference in performance with the v6. I have it running (su and run on boot). my apps keep opening on their own. Not 100% what the desired effect of v6, but I assume it was to control the opening and closing of apps on their own.

 

[pandibear]

No i haven't used any shortcuts...

I was also mistaken... My status just showed network as 1x-rtt with the 4g icon showing... Tether still works afaik but i will test again in a couple hours when i get back home.

Can you tell me what you did to get your tethering working? I seem to get hangs on connecting or it just doesnt connect on the computer. the phone would still work but when I try to use the computer to connect to sites, just hangs and doesnt connect at all.

 

[gitman]

Also, im having trouble noticing a difference in performance with the v6. I have it running (su and run on boot). my apps keep opening on their own. Not 100% what the desired effect of v6, but I assume it was to control the opening and closing of apps on their own.

its more about changing the level of aggressiveness at which android closes idle applications to free up memory for other applications. you can also force android to always keep the launcher in memory.

it is not like the auto-killers and task managers that are out there

 

[Tokenpoke]

Can you tell me what you did to get your tethering working? I seem to get hangs on connecting or it just doesnt connect on the computer. the phone would still work but when I try to use the computer to connect to sites, just hangs and doesnt connect at all.

Rooted and removed all metro stuff.

Factory reset and failed the fota update.

Tether was working last i checked but i didn't test again last night.

 

[Goochy]

its more about changing the level of aggressiveness at which android closes idle applications to free up memory for other applications. you can also force android to always keep the launcher in memory.

it is not like the auto-killers and task managers that are out there

Hmm. I wish I could get android to leave my apps alone and not touch them unless I do. I hate opening atk and seeing a bunch of bullshit running for no aparrant reason.

 

[AlexMiami]

Hmm. I wish I could get android to leave my apps alone and not touch them unless I do. I hate opening atk and seeing a bunch of bullshit running for no aparrant reason.

That drives me absolutely crazy too! I can have like 15 things open for no reason and eating up my memory!

 

[ChiweN]

Shouldn't be that bad with v6 script installed. Amp it up a bit, set it a bit more aggressive.

 

[gitman]

Hmm. I wish I could get android to leave my apps alone and not touch them unless I do. I hate opening atk and seeing a bunch of bullshit running for no aparrant reason.

blame the apps that start themselves at boot and don't give you any kind of "exit" option. don't blame the OS.

 

[Tokenpoke]

blame the apps that start themselves at boot and don't give you any kind of "exit" option. don't blame the OS.

He has a point.
Also anything that checks for
updates and doesn't immediately shut Down after (fb)

 

[skinlab]

I ran V6 myself and also had no 3g turbocharger entries. I did change the settings from the op and do notice some improvement.
And yes, it drives me crazy also with all the unnecessary shit running in the background.

 

[Havocx23]

I've tried several different root explorers (ES file explorer, SManager, File manager) and all have been granted su permissions, and i have the option checked to mount system files as writable but it wont save any of my changes. what can I do about this

 

[Tokenpoke]

I've tried several different root explorers (ES file explorer, SManager, File manager) and all have been granted su permissions, and i have the option checked to mount system files as writable but it wont save any of my changes. what can I do about this

Buy "root explorer"
Works fine for me

 

[dadcup]

how i install v6

 

[jemini1988]

How do i get into the build.prop?

 

[Loveofandroid]

How can I get my "4G" icon back instead of having the "EV" icon ???? PLEASE HELP