[Galaxy S II General] sekhargreen:
[DIY] Do it yourself guides:

Reset Galaxy S II

Warning: All your data including contacts, messages will be lost!

Hard Reset:

Press and Hold Volume Up + Home button.

Keep pressing these two and press Power button for 2-3 seconds.

Release only power button. But keep pressing Volume UP + Home buttons.

Now, with Volume down, select wipe data/facotory reset (3rd)

Press Power

Useful Codes:

*#0*# LCD Screen test

*#06# Show IMEI Number

*#2222# HW Version

*#1234# Phone info

*#34971539# Camera Firmware

*#9900# Sysdump (Logfiles etc.)

*#0228# Battery diagnostics

*#7284# Phone utility

*#7353# Function testing

*#9090# Service Mode

*#*#197328640#*#* Service Mode Menu

*2767*3855# Factory Reset

Complete Codes Collections for SGS II and should work with other Samsung droids many of them.

Warning: Please use with caution

1	#*#8377466#	S/W Version & H/W Version.

2	#*0227#	GPRS Switch.

3	#*0277#	GPRS Switch.

4	#*2027#	GPRS Switch.

5	#*2077#	GPRS Switch.

6	#*2252#	Current CAL.

7	#*2255#	Call Failed.

8	#*2256#	Calibration info? (For CMD set DEBUGAUTONOMY in cihard.opt)

9	#*22671#	AMR REC START.

10	#*22672#	Stop AMR REC. (File name: /a/multimedia/ sounds/voice list/ENGMODE.amr)

11	#*22673#	Pause REC.

12	#*22674#	Resume REC.

13	#*22675#	AMR Playback.

14	#*22676#	AMR Stop Play.

15	#*22677#	Pause Play.

16	#*22678#	Resume Play.

17	#*22679#	AMR Get Time.

18	#*2286#	Databattery.

19	#*2337#	Permanent Registration Beep.

20	#*2351#	Blinks 1347E201 in RED.

21	#*2474#	Charging Duration.

22	#*2527#	GPRS switching set to (Class 4, 8, 9, 10)

23	#*2558#	Time ON.

24	#*2562#	Restarts Phone.

25	#*2565#	No Blocking? General Defense.

26	#*2677#	Same as 4700.

27	#*2679#	Copycat feature Activa/ Deactivate.

28	#*2775#	Switch to 2 inner speaker.

29	#*2787#	CRTP ON/OFF.

30	#*2834#	Audio Path. (Handsfree)

31	#*2836#	AVDDSS Management Activate/ Deactivate.

32	#*2886#	AutoAnswer ON/OFF.

33	#*3270#	DCS Support Activate/ Deactivate.

34	#*3273#	EGPRS multislot. (Class 4, 8, 9, 10)

35	#*3282#	Data Activate/Deactivate.

36	#*3353#	General Defense, Code Erased.

37	#*3370#	Same as 4700.

38	#*3476#	EGSM Activate/Deactivate .

39	#*3676#	FORMAT FLASH VOLUME!!!

40	#*3725#	B4 last off.

41	#*3728#	Time 2 Decod.

42	#*3737#	L1 AFC.

43	#*3757#	DSL UART speed set to. (LOW, HIGH)

44	#*3837#	Phone Hangs on White screen.

45	#*3838#	Blinks 3D030300 in RED.

46	#*3838#	Blinks 3D030300 in RED.

47	#*3849#	Restarts Phone.

48	#*3851#	Restarts Phone.

49	#*3876#	Restarts Phone.

50	#*3877#	Dump of SPY trace.

51	#*3888#	BLUETOOTH Test mode.

52	#*3940#	External looptest 9600 bps.

53	#*3941#	External looptest 115200 bps

54	#*4263#	Handsfree mode Activate/ Deactivate.

55	#*4472#	Hysteresis of serving cell: 3 dB

56	#*4700#	Please use function 2637.

57	#*4760#	GSM Activate/Deactivate.

58	#*4773#	Incremental Redundancy.

59	#*4864#	White Screen.

60	#*5133#	L1 HO Data.

61	#*5171#	L1P1.

62	#*5172#	L1P2.

63	#*5173#	L1P3.

64	#*5176#	L1 Sleep.

65	#*5187#	L1C2 G trace Activate/ Deactivate.

66	#*5376#	DELETE ALL SMS!!!!.

67	#*5737425#	JAVA Mode.

68	#*6833#	New uplink establishment Activate/Deactivate .

69	#*6837#	Official Software Version: (0003000016000702)

70	#*7200#	Tone Generator Mute.

71	#*7222#	Operation Typ: (Class C GSM)

72	#*7224#	!!! ERROR !!!

73	#*7252#	Operation Typ: (Class B GPRS)

74	#*7271#	CMD: (Not Available)

75	#*7274#	CMD: (Not Available)

76	#*7284#	L1 HO Data.

77	#*7287#	GPRS Attached.

78	#*7288#	GPRS Detached/Attached .

79	#*7326#	Accessory.

80	#*7337#	Restarts Phone. (Resets Wap Settings)

81	#*7352#	BVMC Reg value (LOW_SWTOFF, NOMINAL_SWTOFF)

82	#*7372#	Resetting the time to DPB variables.

83	#*7462#	SIM Phase.

84	#*7524#	KCGPRS: (FF FF FF FF FF FF FF FF 07)

85	#*7562#	LOCI GPRS: (FF FF FF FF FF FF FF FF FF FF FF FE FF 01)

86	#*7666#	White Screen.

87	#*7683#	Sleep variable.

88	#*7693#	Sleep Deactivate/Activate .

89	#*7722#	RLC bitmap compression Activate/Deactivate .

90	#*77261#	PCM Rec Req.

91	#*77262#	Stop PCM Rec.

92	#*77263#	PCM Playback.

93	#*77264#	PCM Stop Play.

94	#*7728#	RSAV.

95	#*7732#	Packet flow context bit Activate/Deactivate .

96	#*7752#	8 PSK uplink capability bit.

97	#*7785#	Reset wakeup & RTK timer cariables/variables.

98	#*7828#	Task screen.

99	#*7878#	FirstStartup. (0 NO, 1 YES)

100	#*7983#	Voltage/Freq.

101	#*7986#	Voltage.

102	#*8370#	Tfs4.0 Test 0.

103	#*8371#	Tfs4.0 Test 1.

104	#*8372#	Tfs4.0 Test 2.

105	#*8373#	Tfs4.0 Test 3.

106	#*8374#	Tfs4.0 Test 4.

107	#*8375#	Tfs4.0 Test 5.

108	#*8376#	Tfs4.0 Test 6.

109	#*8377#	Tfs4.0 Test 7.

110	#*8378#	Tfs4.0 Test 8.

111	#*8379#	Tfs4.0 Test 9.

112	#*8465#	Time in L1.

113	#*8466#	Old Time.

114	#*8724#	Switches USBACM to Generator mode.

115	#*8725#	Switches USBACM to Loop-back mode.

116	#*8726#	Switches USBACM to Normal.

117	#*8727#	Switches USBACM to Slink mode.

118	#*9270#	Force WBS.

119	#7263867#	RAM Dump. (On or Off)

120	*#*#4636#*#*	Access Phone/Battery/Usage Stat/WiFi Info

121	*#0*#	Access Sensor/LCD Screen Test/ Vibration/ Camera/ Speaker etc test

122	*#0011#	ServiceMode/Debug /Basic

123	*#06#	IMEI Number.

124	*#1234#	Firmware Version.

125	*#2222#	H/W Version.

126	*#2255#	Call List.

127	*#232337#	Bluetooth MAC Adress.

128	*#4777*8665#	GPSR Tool.

129	*#5282837#	Java Version.

130	*#8999*327#	EEP Menu.

131	*#8999*364#	Watchdog ON/OFF.

132	*#8999*377#	Error Menu.

133	*#8999*427#	WATCHDOG signal route setup.

134	*#8999*523#	LCD Brightness.

135	*#8999*667#	Debug Mode.

136	*#8999*8376263#	All Versions Together.

137	*#8999*8378#	Test Menu.

138	*#92782#	PhoneModel. (Wap)

139	*2767*226372#	E2P Camera Reset. (deletes photos)

140	*2767*2878#	E2P Custom Reset.

141	*2767*3855#	E2P Full Reset.

142	*2767*688#	Reset Mobile TV.

143	*2767*927#	E2P Wap Reset.

Useful Links

-Debrand & Rebrand back to O2 for Samsung Galaxy S2

-Permanently Fix SGS2 Echo and Digital Noise Reduction/Cancellation Problems

-Back up your data before moving to a new rom

-Recover your IMEI in 9 steps.

-Battery Saving Tips Collection

Mods:

-add customizable 14 statusbar toggle buttons for samsung ROM

-Long press volume buttons to skip songs.

-Manually Deodex and Odex back

-Learn to make your own 'eye-candy' mods [Easy Steps]

Tools:

-EFS Pro v1.2.6 - Advanced '/efs' Backup and Restore!

Patches:

-Add native android SIP stack for Wifi AND 3G calls

-Extended Power Menu with no header (reboot / download / recovery)