Hello
Here I leave everything to ROOT and unlock SAMSUNG i9003 sw 2.3.5 & 2.3.6. It is very easy and you don´t loose phone´s files. Same process how root i9100 that you can read in support / Polar files.
The package has Odin3 v1.85 and rooting files.
Regards
Device Data...
Model: GT-I9003
Product Code: GT-I9003MKDXEC
IMEI: 359930-04-542xxx-x
S / W Version : 2.3.6 GINGERBREAD
Firmware : I9003XXKPQ
Cid: 00d53311
Serial: 000000000000000
CPU: ARMv7 Processor rev 2 (v7l)
Hardware: Latona Samsung Board
Checking if Root...
Root TRUE...
Reading Backup....
Backup Saved in Folder Backups/Samsung
Phone Rooted OK...
Phone Connected Ok...
Reading SpLock ...
Contacting With Server...Wait...
Credits Consumed : 0
Phone Codes...
___________________
Net Code : 42407293
Sub Code : 00000000
SP Code : 00000000
SIM Code : 00000000
UnFreeze Code : 07248526
Insert Not supported Sim In The Phone
After type You Code in Keyboard
Press Calling OK Key
Maybe get the message < Unlock Error >
But you Device Is Unlocked
Codes Readed Ok...
Rebooting Phone...