I can flash R306 "signed" with a customization file only, no problem at all.
but, on the same phone and with the same flash file, I couldn't unlock it with "unsigned" - "unlock", here is the log for failed unlock,
Code:
14:05:25 SE S1 Flasher & Unlocker v1.00 by Cruiser Team
14:05:25 Initializing...
! 14:05:25 1. Choose the phone model
! 14:05:25 2. For flashing, select flash files and additional options
! 14:05:25 3. Double-click on the appropriate device (serial cable)
14:05:51 Connecting via Generic FTDI Cable (COM14)…
14:05:51 Device driver version: 1.0.2176.0
14:05:51 Device driver date: 12-12-2005
! 14:05:51 Connect the phone now
14:05:51 Connecting to the baseband CPU...
14:06:07 Reading TA…
14:06:18 Reading EROM…
E 14:06:48 Error: 0x714C6E71
E 14:06:48 Error: 0x9051B62B
E 14:06:48 Error: 0x747DD20E
E 14:06:48 Error: 0x4AA1308E
E 14:06:48 Error: 0xAEE02F1D
E 14:06:48 Error: 0x59E001A2
E 14:06:48 Failed!
! 14:06:48 Please disconnect battery and cable from the phone!
! 14:06:48 To report errors right-click this window