Someone gave my daughter a (hardly) used Samsung Galaxy S2, still on Gingerbread.
Did a lot of research online (rooting for dummies guide, S2 specific sites, youtube videos, etc) and managed to
Successfully Root it and installed CWM based recovery v126.96.36.199
Installed Resurrection Remix Lollipop specific for my S2 device (i9100)
It was a successful install, for 2 weeks. My kid used the new Lollipop ROM with no problems (except the occasional freeze, but still reboots OK).
Then one day, it just froze and won't reboot to OS anymore.
Boots up, shows the logo for 2 secs, then shuts down. We took out the battery for hours, recharged the battery, still the same.
Entered back to Recovery Mode, Wiped cache partition, Dalvik cache (and later, various storage area space) and tried to Install a ROM zip again (Resurrection Remix).
AT FIRST, it shows that its installing for a few seconds, then shuts down.
After several repeated attempts, it won't even show any progress, as soon as I choose the file and select it, the device shuts down.
Then it reached a point where even wiping cache will cause the device to shut down.
Plus, its getting increasingly difficult to enter Recovery Mode. It now takes me several attempts to boot back into Recovery Mode.
Download mode (Odin Mode) I can get into without much difficulty though.
I even downloaded a different ROM (CYANOGEN+OS+12.1S+V.1.0+s2+GT-I9100) but it won't install either (also shuts down).
Now Device just boots and gets stuck at the Samsung logo, and as I said, it's really difficult now to get back into recovery mode.
Is this a hardware issue or is there something else I can try?