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Old December 23rd, 2012, 11:01 AM   #1 (permalink)
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Default Jelly Bean 4.2.1 on SGS2

Has anyone tried out JB 4.2.1 On The Galaxy s2??

http://forum.xda-developers.com/showthread.php?t=1806401

Found this over at xda and are wondering of trying it out on my phone.

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Old December 24th, 2012, 09:26 AM   #2 (permalink)
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It would be nice if anyone could tell me if it is good to go or i should just jump in it and try it out??
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Old December 24th, 2012, 11:33 AM   #3 (permalink)
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I've not got it, but it's 4.1.2 based on CM10 not 4.2.1 isn't it?

Still looks very good though.
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Old December 24th, 2012, 11:42 AM   #4 (permalink)
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I moved this thread to the Samsung Galaxy S2 (International) > Galaxy S2 (International) - All Things Root forum. I think you'll get a better response here.
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Old December 24th, 2012, 11:32 PM   #5 (permalink)
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ive been running 4.2.1 vsync build by mcm for the past week or so

http://forum.xda-developers.com/showthread.php?t=1891222

the rom is fantastic, ive tried all 3 kernels, siyah v4 very smooth, siyah v5 seemed to chew my battery for fun, stock kernel suits my device best.

mcm is a very active dev and we seem to get cherry picked updates on a daily basis.

IMO even in its early stages 10.1 is smoother, far more responsive than i could ever get on cm10

EDIT : Merry Xmas all
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Old December 25th, 2012, 06:26 PM   #6 (permalink)
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Do you unzip it in recovery or use odin? I tried to flash it true recovery, but it fails...... ??
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Old December 26th, 2012, 01:06 AM   #7 (permalink)
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its a cwm flashable zip, no need to unzip

just place rom, latest gapps, kernel of your choice on sdcard

boot into recovery and flash

i`m guessing you are rooted already ?

Edit: which variant of sgs2 are you running (ie international, G), and also you're not trying to flash this on your Note are you?
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Old December 27th, 2012, 01:56 AM   #8 (permalink)
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International sgs2 and no, not my note i tried out bajee11 build, and it was good, but i found out that i should learn more before i jump ahead. So im back on the leaked 4.1.2 until i have learnd more

Edit: i also found out that i had too root from my first backup, because when i tried to install new rom or kernel when i was running the leaked version 4.1.2 and rooted, it faild all the time
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Old December 27th, 2012, 02:49 AM   #9 (permalink)
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no need to reroot ,it will fail if you are using philz kernel, the trick is to flash siyah vsync kernel or CM stock kernel, reboot recovery (advanced) then flash rom and gapps.

this will still apply wether you try cm10 or cm10.1
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Old December 28th, 2012, 02:23 AM   #10 (permalink)
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Using rootbox 3.3.1 Android 4.2.1 on my S2 I9100 for past few days, nice and relatively bug free compared to other 4.1.2 and 4.2.1 roms.

Only downside is lower battery life and i think it's to do with kernel and cpu states in 4.2.1 in general.

S2 I9100 Optus Australia + Mugen 3200mah battery
  • Stock 4.0.4 LQ6 = average 60-90hrs with up to 8hrs screen time 24/7 wifi
  • Rootbox 4.2.1 LQ6 = average 17.5 to 18.5 hrs with 5.5 hrs screen time and 24/7 wifi

Clawing my way back with setcpu profiles for some commonly played games and apps reducing their speed from 200-1200mhz min/max ondemand governor to 200-800mhz for specific apps and 1000mhz for everyday general. On current battery usage patterns I might now get 22-25hrs with Rootbox 4.2.1 LQ6.

I went from

Stock non-root 4.0.4 LQ6 > Siyah 4.1.5 kernel root > Rootbox 3.3.1 Android 4.2.1.
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Old December 28th, 2012, 03:32 AM   #11 (permalink)
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have not tried the rootbox version of 4.2.1 so cant comment on it

thats pretty bad battery usage youve got right there, im getting more than that on stock battery.Ive been testing different kernels and have come to the conclusion that siyah V5 is the best all rounder.

cm10i9100vsync - Browse /kernel at SourceForge.net

Download from there, latest version from this morning is already up.

also download media scan root allow your phone an hour or so read all the files, recharge, reboot, and then disable media scanning with it https://play.google.com/store/apps/details?id=com.addz.mediascannerroot&feature=searc h_result#?t=W251bGwsMSwxLDEsImNvbS5hZGR6Lm1lZGlhc2 Nhbm5lcnJvb3QiXQ..

I found that media scanner was the worst culprit for battery drain
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Old December 28th, 2012, 04:13 AM   #12 (permalink)
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Yeah quite a dramatic drop in battery life. Here's what BBS and GSAM Battery Monitor report Samsung S2 I9100 Rootbox 3.3.1 Android 4.2.1 Battery - Imgur

Media scan or idle/phone screen off for me isn't a problem from what i see. Just on screen usage
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