You need PYTHON to do it
1. Download http://fou.vizz.pl/kostek/apptrk.zip and extract it to memory card, leave the folder structure!
2. Download http://fou.vizz.pl/kostek/trk.zip and extract it to c:\python or e:\python on your mobile
3. Run trk.py, APP TRK should start now.

I didn't tested it yet, can somebody test it for me?

I tested this but the pyhton script gives an SymbianError: [Errno -46] KErrPermissionDenied

The crack is not working :(:(

is there any solution to downgrade from version 300.34.84 to 210.34.75...??

:)

The crack is not working :(:(

is there any solution to downgrade from version 300.34.84 to 210.34.75...??

:)

Unfortunately not: AFAIK Nokia does not allow the firmware downgrading via NSU or any other method we can use :|

JM

There is a way how to proceed Downgrade your Firmware, but the way is so hard and complicated, that it's better don't do that, or you can change your phone just into useless brick :afraid:

Hey mate no hacks have arrived for E90 don't waste your and others time by spamming wrong instruction.
So jus wait for the New Hacks to arrive.