Shelly duo refuses to flash mgos to tasmota

[hansa031]

I have a Shelly duo with firmware 20230913-111821/v1.14.0-gcb84623 and when i do a: http:///ota?url=http://dl.dasker.eu/firmware/mg2tasmota-ShellyDuo.zip it show :
status | "updating"
has_update | false
new_version | "20230913-111821/v1.14.0-gcb84623"
old_version | "20230913-111821/v1.14.0-gcb84623"
beta_version | "20231107-162700/v1.14.1-rc1-g0617c15"

but it does not the flash the mgos to tasmota firmware.

When I do http:///ota?url=http://firmware.shelly.cloud/gen1/rc/SHBDUO-1.zip it does flash to the beta version of the Shelly firmware.
Please help me. Thanks!

Grt,
Hans