Quote:

Step1: First connect your device to PC (desktop/laptop) via USB and make sure that USB debugging enabled on your device.



Step2: Now to be on safe side create a Nandroid backup from recovery its because if something goes wrong then you can easily backup all your data.



Step3: After creating backup, now download the ROM (FFOS_mako_********.zip) file and place these files on the SD card of the phone.



Step4: Now switch off the phone and boot the phone into Recovery mode.



Step5: Assuming you are in the Recovery mode and now you have to wipe the full data on your device. To do this, you have to click on “Wipe Data/Factory Reset” option. As soon as you click on “Wipe Data/Factory Reset” option a new screen pop-up where you have to click on “Yes” option.



Step6: After wiping out all the data on your device you have to wipe the cache & the dalvik cache also.



Step7: Now go to “install zip from SD card” option and click on “select zip from SD card”. After selecting the option “select zip from SD card” you have to choose the ROM file.



Step8: After performing all the correctly in step 7 you have to clear the cache and & dalvik cache again.



Step9: Now, go to “Install zip from SD card” option and click on “Select zip from SD card”. After selecting the option “Select zip from SD card”, you have to choose the optional file like home app or server module



Step10 : Assuming you have performed all the steps correctly, now simply reboot your device and it will boot into Firefox OS.