Nokia n900

I updated mine nokia n900,after that it shows no celluar tower.It gives the error message
“All telephony functions, including emergency calls, are disabled due to a communication error. To recover, you might have to reboot the device”.
Of course, reboot didn’t help.
I googled it ,but didn’t found any solution.I re flashed it also but the problem remains.as the mobile is out of warranty,I don’t have any idea what to do.
Please help…
Answer #1
reinstall n900 fimware. search on google how to do it.