Build Instructions

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  Step 1: Unpack & Repack

  Prerequisite

  • ubireader
  • mkfs.ubifs and ubinize (search how to install them)

  Step 1.1: Unpack system_unlocked.img

  ubireader_extract_images system_unlocked.img -o system_u
  cd ./system_u/system_unlocked.img/ 
  

  Now you will get a file with a .ubifs extension.
  In my case, it's "img-35657280_vol-rootfs.ubifs"
  

  Step 1.2: Unpack ubifs

  ubireader_extract_files -k -o ./rootfs img-35657280_vol-rootfs.ubifs 

  You will now have a folder named "rootfs" containing all system files.

  Step 1.3: <Modify Firmware>

  Step 1.4: Repack .ubifs

  mkfs.ubifs -m 2048 -e 126976 -c 1073 -x lzo -f 8 -k r5 -p 1 -l 5 -F -r ./rootfs/ rootfs.ubivol

  Set up the config.ini file:

  touch config.ini
  echo "[rootfs-volume]
  mode=ubi
  image=rootfs.ubivol
  vol_id=0
  vol_size=27807744
  vol_type=dynamic
  vol_name=rootfs" > config.ini

  Change the "vol_size" value when the firmware is modified. Keep it as is unless you encounter size-related errors.

  If you do encounter size-related errors, the error will have the 'vol_size' that needs to be set.
  

  Step 1.5: Repack img

  ubinize -p 131072 -m 2048 -o system_m.img ./config.ini

  You will now have the modified firmware (system_m.img) ready to be flashed using fastboot.

  Step 1.6: Flash using fastboot

  How to Boot in Fastboot:

  • Remove battery from JioFi 3
  • Locate reset pin hole button
  • Lay down JioFi 3
  • Use Paper Clip / SIM Ejector Tool to press button inside (using sharp object is not recommended)
  • Keep pressing button down and insert USB cable
  • Release button as soon as all the LEDs in Display turns RED. This means device is in boot loader mode

  fastboot erase system && fastboot flash system system_m.img && fastboot reboot 
  

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