Disclaimer and warnings buying me a beer Lumia models with Bootloader Spec A - Lumia 520, 521, 525, 526 - Lumia 620, 625 - Lumia 720 - Lumia 820, 822 - Lumia 920, 925, 928 - Lumia 1020 - Lumia 1320 Lumia models with Bootloader Spec B - Lumia 1520 - Lumia 430, 435 - Lumia 530, 532, 535 - Lumia 630, 635, 636, 638 - Lumia 730, 735 - Lumia 830 - Lumia 929 (Icon), 930 - Lumia 540 - Lumia 640, 640 XL - Lumia 550 - Lumia 650 - Lumia 950, 950 XL Supported OS versions for Root Access on models with Bootloader Spec A - 8.10.12393.890 - 8.10.12397.895 - 8.10.14219.341 - 8.10.14226.359 - 8.10.14234.375 - 8.10.15116.125 - 8.10.15148.160 - 10.0.10512.1000 - 10.0.10536.1004 - 10.0.10549.4 - 10.0.10581.0 - 10.0.10586.11 - 10.0.10586.36 Supported OS versions for all Lumia's - 10.0.10586.107 - 10.0.10586.318 - 10.0.10586.494 - 10.0.15063.0 - 10.0.15063.297 - 10.0.15254.1 - 10.0.15254.12 - 10.0.15254.16 (Insider build) - 10.0.15254.124 - 10.0.15254.158 (Insider and production builds) - 10.0.15254.490 - 10.0.15254.527 - 10.0.15254.530 - 10.0.15254.538 - 10.0.15254.541 - 10.0.15254.544 - 10.0.15254.547 - 10.0.15254.603 Windows Device Recovery Tool google search google search Download known bug Download google search google search Unlocking the bootloader Sysinternals PsTools 3rd party file manager Root Access dump OSFMount Root Access flash-function backup flash-function Sysinternals SDelete OSFMount these steps Remote unlock