[Galaxy S II Q&A, Help & Troubleshooting] crypticc:
Warning, either keep a copy of 2.1.1 zip on your sdcard, or keep a recent nandroid backup.

Several people (including myself) are reporting boot-loops on 2.2 beta 1. Others haven't had issues.

You've been warned. Kindest regards.

e.g. below.

D/AndroidRuntime( 5500):
D/AndroidRuntime( 5500): >>>>>> AndroidRuntime START com.android.internal.os.ZygoteInit <<<<<<
D/AndroidRuntime( 5500): CheckJNI is OFF
D/AndroidRuntime( 5500): setted country_code = UK & IRE
D/AndroidRuntime( 5500): setted sales_code = XEU
D/AndroidRuntime( 5500): found sales_code tag = <XEU>, </XEU>
D/dalvikvm( 5500): creating instr width table
I/dalvikvm( 5500): DexOpt: Some deps went away
E/dalvikvm( 5500): /system/framework/core-junit.jar odex has stale dependencies
I/dalvikvm( 5500): Zip is good, but no classes.dex inside, and no valid .odex file in the same directory
I/DEBUG ( 2544): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
I/DEBUG ( 2544): Build fingerprint: 'samsung/GT-I9100/GT-I9100:2.3.5/GINGERBREAD/XWKJ1:user/release-keys'
I/DEBUG ( 2544): pid: 5500, tid: 5500 >>> zygote <<<
I/DEBUG ( 2544): signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr deadbaad
I/DEBUG ( 2544): r0 00000027 r1 deadbaad r2 a0000000 r3 00000000
I/DEBUG ( 2544): r4 00000001 r5 00000000 r6 00026cf8 r7 0000a000
I/DEBUG ( 2544): r8 8048dc63 r9 00000000 10 00000000 fp 000177d0
I/DEBUG ( 2544): ip afd466a8 sp be90d3c0 lr afd196f1 pc afd161c0 cpsr 60000030
I/DEBUG ( 2544): d0 00000000bd6bc8e3 d1 0000000000000000
I/DEBUG ( 2544): d2 0000000000000000 d3 0000000000000000
I/DEBUG ( 2544): d4 0000000000000000 d5 0000000000000000
I/DEBUG ( 2544): d6 0000000000000000 d7 c18af96700000000
I/DEBUG ( 2544): d8 0000000000000000 d9 0000000000000000
I/DEBUG ( 2544): d10 0000000000000000 d11 0000000000000000
I/DEBUG ( 2544): d12 0000000000000000 d13 0000000000000000
I/DEBUG ( 2544): d14 0000000000000000 d15 0000000000000000
I/DEBUG ( 2544): d16 0000000000000000 d17 0000000000000000
I/DEBUG ( 2544): d18 0000000000000000 d19 0000000000000000
I/DEBUG ( 2544): d20 0000000000000000 d21 0000000000000000
I/DEBUG ( 2544): d22 0000000000000000 d23 0000000000000000
I/DEBUG ( 2544): d24 0000000000000000 d25 0000000000000000
I/DEBUG ( 2544): d26 0000000000000000 d27 0000000000000000
I/DEBUG ( 2544): d28 0000000000000000 d29 0000000000000000
I/DEBUG ( 2544): d30 0000000000000000 d31 0000000000000000
I/DEBUG ( 2544): scr 00000000
I/DEBUG ( 2544):
I/DEBUG ( 2544): #00 pc 000161c0 /system/lib/libc.so
I/DEBUG ( 2544): #01 pc 00013b30 /system/lib/libc.so
I/DEBUG ( 2544): #02 pc 000149f6 /system/lib/libc.so
I/DEBUG ( 2544): #03 pc 0004e24c /system/lib/libdvm.so
I/DEBUG ( 2544):
I/DEBUG ( 2544): code around pc:
I/DEBUG ( 2544): afd161a0 2c006824 e028d1fb b13368db c064f8df
I/DEBUG ( 2544): afd161b0 44fc2401 4000f8cc 49124798 25002027
I/DEBUG ( 2544): afd161c0 f7f57008 2106ea16 eb8af7f6 460aa901
I/DEBUG ( 2544): afd161d0 f04f2006 95015380 95029303 eef0f7f5
I/DEBUG ( 2544): afd161e0 462aa905 f7f52002 f7f5eefc 2106ea02
I/DEBUG ( 2544):
I/DEBUG ( 2544): code around lr:
I/DEBUG ( 2544): afd196d0 4a0e4b0d e92d447b 589c41f0 26004680
I/DEBUG ( 2544): afd196e0 686768a5 f9b5e006 b113300c 47c04628
I/DEBUG ( 2544): afd196f0 35544306 37fff117 6824d5f5 d1ef2c00
I/DEBUG ( 2544): afd19700 e8bd4630 bf0081f0 00027e6c ffffff88
I/DEBUG ( 2544): afd19710 b086b570 f602fb01 9004460c a804a901
I/DEBUG ( 2544):
I/DEBUG ( 2544): stack:
I/DEBUG ( 2544): be90d380 00026d28
I/DEBUG ( 2544): be90d384 afd149f9 /system/lib/libc.so
I/DEBUG ( 2544): be90d388 00026d28
I/DEBUG ( 2544): be90d38c 8045bdf5 /system/lib/libdvm.so
I/DEBUG ( 2544): be90d390 afd4274c
I/DEBUG ( 2544): be90d394 afd426f8
I/DEBUG ( 2544): be90d398 00000000
I/DEBUG ( 2544): be90d39c afd196f1 /system/lib/libc.so
I/DEBUG ( 2544): be90d3a0 00000001
I/DEBUG ( 2544): be90d3a4 be90d3d4
I/DEBUG ( 2544): be90d3a8 00026cf8
I/DEBUG ( 2544): be90d3ac 0000a000
I/DEBUG ( 2544): be90d3b0 8048dc63 /system/lib/libdvm.so
I/DEBUG ( 2544): be90d3b4 afd18a13 /system/lib/libc.so
I/DEBUG ( 2544): be90d3b8 df002777
I/DEBUG ( 2544): be90d3bc e3a070ad
I/DEBUG ( 2544): #00 be90d3c0 00000000
I/DEBUG ( 2544): be90d3c4 00000310
I/DEBUG ( 2544): be90d3c8 00000000
I/DEBUG ( 2544): be90d3cc ffffffff
I/DEBUG ( 2544): be90d3d0 00026cf8
I/DEBUG ( 2544): be90d3d4 fffffbdf
I/DEBUG ( 2544): be90d3d8 8048dc63 /system/lib/libdvm.so
I/DEBUG ( 2544): be90d3dc afd46490
I/DEBUG ( 2544): be90d3e0 ffffffff
I/DEBUG ( 2544): be90d3e4 afd13b35 /system/lib/libc.so
I/DEBUG ( 2544): #01 be90d3e8 00000000
I/DEBUG ( 2544): be90d3ec ffffffff
I/DEBUG ( 2544): be90d3f0 ffffffff
I/DEBUG ( 2544): be90d3f4 00000000
I/DEBUG ( 2544): be90d3f8 8048dc63 /system/lib/libdvm.so
I/DEBUG ( 2544): be90d3fc afd149f9 /system/lib/libc.so
I/DEBUG ( 2544): dumpstate /data/log/dumpstate_app_native.txt
I/dumpstate( 5502): begin
D/VoldCmdListener( 2541): asec list
I/dumpstate( 5502): done