[Galaxy S III Android Development] sad0felix:
Good for everyday use

Hello everyone, my 5 quids of experience here.

I come from more than one year on Slim only (SlimBean, then SlimKat) on an I9300 whose software was lightly branded by Three (H3G) Italy. Always treated it as a I9300 International.

Lately I had some problems on SlimKat (reboot with random apps losing settings) so I thought I had problems with internal and/or external flash.

Plans were to install back a clean SlimKat, then I saw this thread and given the few bugs declared I decided to give it a go.

I write everything I did in the most search friendly manner so it might be useful to any less-noob guy seeking help from a search.

FIRST OF ALL: did both a complete nandroid-backup with TWRP and used Titanium to backup all apps (including sys apps, you never know ...).

My external SD is quite big, 32GB, but 8 or 16 would fit the task too in my case.

1) Restored to official JB by Samsung (done that with emergency recovery of Kies 3) and stood with it for a couple of days to check if the settings problem would rise again. It didn't.

2) Pulled the 32GB SD card, copied out everything and formatted it.

3) Rooted the official JellyBean (with Odin), flashed TWRP 2.8.1 (with MobileOdin but I presume Odin would fit even better), then in recovery I wiped EVERY PARTITION (Cache, System, Data, internal SdCard) except external SD card

4) Flashed RR 5.2.1 and LP Gapps, from links in first post

5) Wiped Cache and Dalvik Cache again after flashing, then Reboot System

6) As I like to have Google reinstalling all my apps after clean flash, I connected a USB keyboard to OTG to complete the first boot procedure (tried this after a couple of flashes and a search on the thread, I seem to be the only one liking Google restoring stuff ...)

7) I had no problems with Data connection (so I didn't have to flash the RIL patch), no FC (force close) at all except from Play Services and Play Store when I happened to have both data and wifi shut while restoring. Everything went back to normal when I enebled wifi again

8) apart from known Camera app bug, nothing is really FCing (always used Google Camera, btw)

9) only problem was the battery drain, so severe that even with 1Ah AC adapter it kept discharging battery with screen on.

10) flashed the first compatible LP Kernel I found on the forum, arter97's, and it seemed fixed.

11) flashed SuperSU from chainfire, search on XDA for the ZIP

12) restored SMS (SMS Backup and Restore) and some other apps/settings (no system apps settings, of course) with Titanium

13) today I "dirty" flashed 5.2.2: in TWRP I wiped Cache and System, then flashed RR 5.2.2 and GApps again, then wiped Cache and Dalvik again, then rebooted to system

14) I didn't flash arter's kernel to check if the RR new one gives the same problem of exceptional battery drain. It seems to work well for now

14) it complied ART(Dalvik?) for all the apps and no problem whatsoever

I have 8 email accounts in Gmail app, a thousand contacts, nearly 8k SMS in 60 threads (remember to disable the limit before restoring, had to be patient for the app caching all those SMS), around 150 apps, everything is working smooth and easy.

Nice job, thank you very much.

Cheers everyone.

Devs, if you happen to pass by in Venice (Italy), drop me a note in pvt, you'll be welcomed guests in my little wine bar (I have draught beers too if you prefer ...).