how to repair lgp925 imei null?

I want to repair this lg p925 imei null as I have successful did on lg su760 by flashing the phone (lg su760) but this one (i.e lg p925) is always giving this error below, please what will be the problem and how will I repair it.



Welcome to Octoplus/Octopus Box LG Software version 1.4.3

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Platform: LG Infineon

Connection mode: OMAP

Selected model: P925

Opening "LGP925AT-00-V30b-310-410-FEB-15-2013+0_AP.oct"...OK

Please, disconnect battery and connect P999 cable (with 910k resistor).

Initializing device...OK

Writing Firmware...

Connecting to modem CPU...OK

Sending preloader...Failed!

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