You need to install the patch firmware first as explained here Workaround for a regression in the Telega Bootloader v1.x affecting the users of the legacy firmware Telega v0.x - #2 by pavel-kirienko
Then install v0.6
You need to install the patch firmware first as explained here Workaround for a regression in the Telega Bootloader v1.x affecting the users of the legacy firmware Telega v0.x - #2 by pavel-kirienko
Then install v0.6