Hi for a week I bought a C902 from some guy, no gurantee and not very expensive. Any way after two day I upgraded my firmware through the dedicated software application from the SE.com. After a day nitmare, keys *, 7,4 have problems of working, there are times when they work ok, and times like now when not, i had on it, the CDA Baltic, I`m from Romania, and change it to Central European, some time from now I will try to upgraded it again from SE.com. I fear that can be a hardware problem. Any way if you have some advice it would be welcome, in two days I will go to a Service Center. Thank you !!! Sorry for my english

Have you dropped the phone at any time?

Maybe water damage?

R3EA038
prg12041731_Generic_AO R3EA038
EPEROM:1200-4341
SEMCBOOT R6A016
Customization
1201-0116R6A
1204-8246 R3EA038
NORDIC

Java SW version
JP-8.3.3

This is part of it sofware I think the most important part
I personaly dont droped it, but I dont know what`ve done the guy before me.
I know I should buy this kind of staff.
Any way you have a lot more experience then me, what this simptomes look like? Problem whit the wrist that connects keyboard with motherboard?!

If you feel confident enough, open it up and check the membrane

I dont have the tools and experience with it, I saw on the net how it`s done, i will go to a service center to see what can be done. Thank you all for answers, i think the phone get some bumps but nothing visible, on the exterior looks perfect