An Update Server URL is Simply a Custom Server Your PS3 can take updates from.
The Purpose of using one is just to really save time and not go to your pc and back updating your system or downgrading it.
This will be constantly updated with CFW's.
1: You Must Have a DEX QA Toggled System(You Should)
2: Go To The Debug Settings Menu on Your CFW PS3.
3: Find 'Update Server URL'
4: Now Enter That and What You Will Want To Enter is :
" [HIDE] http://184.108.40.206/PS3/stay.html[/HIDE] " (without the quotes)
5: Go To System Update and update via internet Then You Should See the different CFWs/Downgraders you can choose From.
CFW Updates On The Server:
[HIDE]3.55 Downgrader CEX
3.55 Downgrader DEX
4.21 ROGERO V2
4.31 REBUG D-REX
4.40 REBUG D-REX
4.41 REBUG D-REX
4.46 REBUG D-REX(DEX)
4.65 REBUG REX
4.65 REBUG D-REX
BaSs HaXoR 4.46 REX MFW(modded lines and custom boot sfx)
4.70.1 REBUG D-REX
4.70.1 REBUG REX
4.70 Playerkp420 MFW[/HIDE]