( 2 ) The second method is to use rabbit disassemble repair instrument repair . Restore phone directly to the factory state , this method is simple and quick , but the only drawback is : If the phone due to the origin of different reasons , will repair the phone display appears subdued black or partial failure .

( 3 ) The third method is to use free phone disassemble repair instrument readout original password , enter the correct password and then boot after half an hour .

2 Contact service provider (ContactService)

    Early 8110,3810 phone good repair , simply rewrite the chip or chips , can be rewritten version together , 5110 after the phone is much more troublesome , and here are two cases :

( 1 ) If the PCM codec IC loose solder or central processor , such as 5110,6110,6150 phone , welding PCM codec IC and the central processor. If 8810,8210,8850,7110 and other BGA package phone , then remove the PCM codec IC reforestation ball , and then installed. If the central processor Weld , then the central processor unit has some Nokia sol difficult replanting , reloading , silica stationary methods available to solve .

( 2 ) If a chip or a version of the software error caused the " contact service provider" fault , then put version , chip , PCM codec IC to replace them all .

3 network lock

    That is, when the aircraft hit the 112 normal, but after inserting the card display will appear the words " wrong card" . In this case, China 's mobile phone overseas with people more common , foreign GSM phones are generally cheaper Burgundy , gave the card when you buy the phone , send the bill to prevent malicious clients purchase ( after buying the phone hands to sell ) or treadmill ( from winter to buy cheap mobile phone network operators at B network operators to bid at the NIC ) , measures are often taken to start the network lock feature allows only recognize a phone card or a mobile phone network . Such failures , in the present circumstances , can only be used by " contact service provider " fault repair method to deal with.

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