Upgrade i-mate JAMin from WM5 to WM6.5 - How to?

[EyeAm]

Hi!
To upgrade my i-mate JAMin from WM5 to WM6.5 I spent several hours to find out how to do.
This forum is very confusing for me.
I was not able to find out what should be done (step by step).
I know, I'm not an expert. I just want to upgrade my phone and use it again - hopefully without troubles.
Can anybody give me a hint in a clear and brief way?
Thank you in advance.

[marekPLPH]

i can give you my own guidelines but these guys made better ones already.. just need to read carefully


http://forum.xda-developers.com/showthread.php?t=350033

*skip the procedure 3 and 4 if your ROM has nk.nbf filename already


heres another one if you you need to recover your old device just in case you fail upgrading...

http://forum.xda-developers.com/showthread.php?t=310452
http://forum.xda-developers.com/showthread.php?t=353547

got errors before starting to flash? read the attached file...

thanks to owners of these posts!

[EyeAm]

hi marekPLPH, thank you for your information. I finished the upgrade successfully few minutes ago. Unfortunately there seams to be some problems (performance, refreshing the display etc).
I'll have a look within this user-platform here to find out how to downgrade from WM6.1 to WM5.

[marekPLPH]

did you hard rest your device? com+cam button+soft reset button?