when i do it through fastboot, the phone gets stuck on boot. 6.0.1 nexus 5
ESN calculates from the MEID number. MEID is same as the imei but without the last digit (atleast it was the case checking 3 working nexus 5. 2 D821 and a D820).
I had a same problem when I tried it on my nexus.
What worked for me is to restore the zeroed out efs with twrp. Check MEID and IMEI then select read, then enter your imei end meid then select write. Reboot the phone check if the imei is still 0 or not. If 0 click on read again. Select esn write yout imei end meid click on write, then click on read then click on write again. It would show an error that esn is read only, but just ignore that. Reboot the phone. If the imei still 0 then restore the zeroed out efs and do everything again.
For me after fixing the efs i could not get any 4G signal (I have D821), I decided to flash the QCN file which for D820 to enable lte band 3 and 8. Then afterf that I reverted the nv item 6828 and 6829 to the default value 524501 (this is for D821). And finally I got 4G signal ( atleast for band 3, because that is the only lte band in my country)
I spent a whole day with my repaired efs. I made a few phone calls and surfet the web and everything worked fine, but I havent tested what is with sms and mms. Then I flashed back my original efs.
|efs, imei 0, nexus 5, no efs backup|
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