If you managed to update to 1.0.2.5 there is recovery mode: Recovery mode If a factory reset cannot be performed or if the device has booting issues, Unplug USB cable and turn off device Press volume down and power on the device Plug in USB cable and using USB networking telnet to 192.168.2.15 or 10.42.66.66 and follow the instructions (from: https://together.jolla.com/question/...22013/#details)
Type the number of the desired action and press [ENTER]: ----------------------------- Jolla Recovery v0.1 ----------------------------- Welcome to the recovery tool! The available options are: 1) Reset phone to factory settings 2) Reboot phone 3) Exit Type the number of the desired action and press [ENTER]: 1 Are you really SURE? If you continue, ALL DATA (pictures, videos, messages, accounts and all the personal data) stored in the device memory WILL BE ERASED! [y/n] y [CLEANUP] Starting cleanup! [CLEANUP] Umounting top volume... [CLEANUP] Deleting /mnt [CLEANUP] Cleanup done. Mounting /dev/mmcblk0p28 on /mnt mount: mounting /dev/mmcblk0p28 on /mnt failed: Invalid argument [ERROR] Can't mount '/dev/mmcblk0p28' to '/mnt' [CLEANUP] Starting cleanup! [CLEANUP] Umounting top volume... [CLEANUP] Deleting /mnt [CLEANUP] Cleanup done. Connection closed by foreign host.