How To Use Nokia Flasher Tools
1. Power off your phone
2. Hold down volume down and power button at the phone for about 15 seconds
3. Connect the phone to PC with Micro-USB cable
4.  Install Nokia Usb driver  on PC if you haven’t done it
5. Download Nokia X Flasher here

How To Use Nokia Flasher Tools

6. Click on system button and locate the “RM-xxx_x.x.x.x_system.img” 
7. Click on boot button and locate the “RM-xxx_x.x.x.x_boot.img” 
8. Click on recovery button and locate the “RM-xxx_x.x.x.x_recovery.img” 
9. Do the same with preload, variant, and others if you downloaded it too
10. After you sure you put the right file, click on Start Flashing button and wait for about 15 minutes, after it, Click on Reboot button

CODEs for Nokia X RM-980/RM-981
Quote:
059V301: RM-980 GLOBAL SWAP
059T991: RM-980 NDT APAC ID ERA
059T992: RM-980 NDT APAC ID PAR
059T993: RM-980 NDT APAC ID TRI
059T9F0: RM-980 NDT APAC MY
059T983: RM-980 NDT APAC TH
059T982: RM-980 NDT APAC VN
059T9D8: RM-980 NDT EURO PL
059T989: RM-980 NDT EURO TR
059T9G1: RM-980 NDT EURO UA
059T9G0: RM-980 NDT IMEA AE
059T9F2: RM-980 NDT IMEA EG
059T985: RM-980 NDT IMEA IN
059T9F4: RM-980 NDT IMEA KE
059T9F9: RM-980 NDT IMEA KW
059T9F5: RM-980 NDT IMEA NG
059T9F7: RM-980 NDT IMEA OM
059T986: RM-980 NDT IMEA PK
059T9F8: RM-980 NDT IMEA QA
059T9F6: RM-980 NDT IMEA SA

CODEs for Nokia X+ RM-1053
Quote:
059V838 NDT APAC VN
059V856 NDT IMEA SA
059V858 NDT IMEA QA
059V841 NDT IMEA IN
059V860 NDT IMEA AE
059V8T0 PWBASSY LIGHT SWAP ENGINE GLOBAL
059V8T2 GLOBAL SWAP

CODEs for Nokia XL RM-1030
Quote:
059V6G3 NDT APAC VN
059V6S5 NDT IMEA AE
059V6P8 NDT APAC ID PAR
059V6P1 NDT APAC TH
059V6S4 NDT IMEA KW
059V6R1 NDT IMEA NG
059V6R0 NDT IMEA KE
059V6P7 NDT APAC ID ERA
059V6Q1 NDT EURO TR
059V6Q9 NDT IMEA EG
059V6S3 NDT IMEA QA
059V6S0 NDT IMEA SA
059V6S2 NDT IMEA OM
059V6P9 NDT APAC ID TRI
059V6P6 NDT APAC MY
059V6P5 NDT APAC KH
059V6Q0 NDT EURO RU
059V6Q7 NDT IMEA PK
059V6Q4 NDT EURO KZ
059V6Q2 NDT EURO PL
059V6Q3 NDT EURO UA
059V8V2 PWBASSY LIGHT SWAP ENGINE GLOBAL
059V935 NDT IMEA BD
059V8V0 GLOBAL SWAP