Can't flash connectivity bridge anymore on thingy91 board

Hi,

I'm using thingy91 for several weeks now and wanted to erase everything to start again from a clean basis.

I followed the guide https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/app_dev/device_guides/thingy91/thingy91_updating_fw_programmer.html#updating-the-conn-bridge-52840 to flash the connectivity bridge using the nordic programmer app and a J-link (external debug prob) but without success. 

Below is the error I got:

 

11:21:51.753	Failed "writing hex to application core". Error: code: 1, description: Generic, message: Batch task program failed, Timed out waiting for response from worker.
11:21:51.839	Error: Failed with exit code 1. One or more batch tasks failed: * 802000186: Timed out waiting for response from worker. (Generic) Message: Batch task program failed, Timed out waiting for response from worker.

I also tried to build and flash manually the connectivity bridge using the following west commands: 

west build -b thingy91/nrf52840
west flash --recover
OR
west flash --erase

as advised on another post, but still without success

What can I try next?

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