Jelly Bean 4.2.1 on SGS2

es82mod · Dec 23, 2012

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.

es82mod · Dec 24, 2012

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??

geoffibs · Dec 24, 2012

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.

lunatic59 · Dec 24, 2012

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.

iT0mm0 · Dec 25, 2012

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

es82mod · Dec 25, 2012

Do you unzip it in recovery or use odin? I tried to flash it true recovery, but it fails...... ??

iT0mm0 · Dec 26, 2012

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?

es82mod · Dec 27, 2012

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 :mad:

iT0mm0 · Dec 27, 2012

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

connectandroid · Dec 28, 2012

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.

iT0mm0 · Dec 28, 2012

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/...SwxLDEsImNvbS5hZGR6Lm1lZGlhc2Nhbm5lcnJvb3QiXQ..

I found that media scanner was the worst culprit for battery drain

connectandroid · Dec 28, 2012

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

Jelly Bean 4.2.1 on SGS2

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