N91 keypad doesnt work

Possible fault in the mother board. Open set and Use a dryer to take offf any signs of moisture or condensation of sweat within.
There can be logging into the plated through holes of the double sided board losing contact.
If after cleaning and fiitting back there is no result, I am afraid the fault can be the mother board.

How To Unlock Nokia N91 1. Type #PW+
2. Enter your unlock code
3. Now type +1#
4. Your Nokia N91 should say “SIM Restriction Off”
Now you should have an unlocked Nokia N91 that you can use with any phone carrier or network. Just buy a SIM card for that phone carrier and order service. Of course this phone guide will only work on SIM enabled phones and not CDMA phones.

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hey there, please flash your cell or take it to a cell repair shop and they will do it for you no need for screw drivers only cable for that prob.

The only solution for that problem is to send your phone to your Local Nokia Service Centre.

it seems you have drop waterto your keypad you must making dry first after that disasembly blackberry casing and keypad and brush it with toothbrush and alkohol 100 %

try other sims of the sam network

please try to replace the keypad and while repalcing let the phone dry in a place free from moisture for an hour

suggest me what are the external softwares supported for NOKIA N91 4Gb

replace the nonresponsive keypad...

It might the problem of the harddrive because N91 are alway make this problem. it a good idea to change the hard drive