6700 Classic screen flashing on and off since scre...

I have just changed the LCD screen on my 6700. The new screen works fine whilst the phone is in use, but as soon as the normal standby happens, ie after about 20 seconds, the screen starts to flash on and off. As soon as any of the buttons is pressed the screen stops flashing and is on and back to normal. I have tried resetting to factory default. Tried to update firmware, but the version is 10.50 and is unable to be updated.
Is there a way to obtain the latest version of the firmware via my PC so that it can be uploaded to the phone?
Is it possible that there may be a fault with the screen or ribbon cable, which is strange as the screen work fine and displays all pixels when in use.
Any suggestions as to what can be tried next?

Thanks for speedy reply.
Yes I did change the screen myself as the local approved Nokia Repair Centre would not replace the screen under warranty as they stated that cracked screens are not covered by the Nokia warranty. They then mentioned that they had none in stock anyway and were not placing their next order until 24th October.
I have now put the cracked screen back into the phone and normal operation has been resumed. From this I conclude that although the new screen worked fine when the phone was in use, there is an inbuilt fault that causes the flashing.
Thanks for the info on the updates, that was the process that I was trying to use. Once i typed in the code number from the phone, the website said that 10.50 was the correct firmware.

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6700 Classic screen flashing on and off since scre...

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