HTC Tytn ~ No Service

[silentxpert]

Hi Every1!!
I have used HTC Tytn with Windows Mobile 5 previously... today I have bought another one with windows mobile 6 professional...

It was prefectly alright... I tried GPRS/Edge... Msging... Calling... Everything....

I tried to install persian language... it asks for reset... I do it... and after that my HTC stops at Windows mobile logo for a long time... I reset thrice and then take out the battery pack... remove SD Card... Remove Sim... and it works...

But after that when i have inserted sim it shows No service...
Although i have tried to change the automatic network selection to manual from Start> Settings> Personal> Phone> Network
It shows all the services availble in my country but when i select the one i am using.. It first shows the message box registring sim on the network.. and then the same error...

I have tried multiple sims but not a single sim works.. while the same sims are working absouletly great in the other sets

Can any body help me to solve this problem...
I guess it is due to windows mobile 6... can any body guide me how to uninstall wm6 and install wm5!!

[ultramag69]

If you bought the Hermes 2nd hand it could have been reported stolen meaning that you won't get it working on the network. It may also be locked but I'd suggest checking with your network if it has been reported stolen. You'll need the IMEI number, dial *#06# to get it.

If its not you could try to sim unlock it.

Cheers...:D

[silentxpert]

but i m able to recive msgs on that sim... how is that possible if set is blocked??....
I have searched on the internet.... this problem also arises to other uers who upgraded from WM 5 to WM 6.. thats why i have thought that this problem is due to WM 6..
Any body guide me how to unistall WM6 and install WM5