[Xperia 10 II] Unable to reach Recovery Mode

I was following the instructions from https://jolla.zendesk.com/hc/en-us/articles/360021620740

  • Disconnect the USB cable from Xperia 10 II
  • Turn the phone OFF
  • Force your Xperia 10 II or Xperia 10 III to the fastboot mode:
    • ensure that the LED at the top of the display area is lit in BLUE colour
      I get to
      sudo fastboot flash boot_a hybris-recovery.img
      sudo fastboot flash boot_b hybris-recovery.img
      sudo fastboot reboot

Afterwards the Phone is stuck in a reboot loop, and does not show the expected “RECOVERY: Connect USB cable and open telnet to address 10.42.66.66” at the top.

Tried with Linux and Windows. I always get to the “(sudo) fastboot reboot” part. Device reboots but does not display the recovery mode.

Tried recovery image from 4.3.0.15 and 4.4.0.58. Is there a possibility to get older releases?
I would like to avoid re-flashing the device, but I’m starting to think this may be my only option.

Anything I’m doing wrong or hints/tips you can give me?

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