I have a UK sourced 1.1.2 OTB 04.02.13_G (4.6BL) jailbroken with the method here: http://www.sixth-ave.com/iturbo.htm working great with an O2 PAYG SIM

I'm tempted to update to 1.1.3 then use the ZiPhone v2.2 Windows GUI -j -a -u method to re-jailbreak, activate and unlock but I have read in another thread that if this method is used on a UK phone an O2 SIM does not work afterwards.

Using this method is the 4.6BL downgraded to 3.9BL?

Can anyone in the UK tell me if they have done the 1.1.2 --> 1.1.3 update then used ZiPhone v2.2 to -J -A -U, if so does the phone have ANY errors, problems ETC and if everything is OK will an UK O2 PAYG SIM still work?

[edit] [added]

Does ZiPhone v2.2 GUI run in Windows Vista 32

Only the -b argument downgrades the baseband. Running the command you listed will retain 4.6. Or if you use the GUI, only check the first 3 boxes, don't check the downgrade bootloader box.

Ziphone 2.2 GUI runs well under Vista 32bit. No problems on my PC.