Error. Cannot read firmware version, hence upgrade not possible. When return to the software ubuntu

Error occurs when try return to the software ubuntu by lan and wirreless on :

NanoStation M5 and NanoStation Loco M5

ePMP Elevate NSM5-XM-V2

ePMP Elevate NSlocoM5-XM-V2

try on ePMP Elevate 

ePMP Elevate Software Release 4.3.2 / 25-Apr-19
ePMP Elevate Software Release 4.4.3 /03-Dec-19
Beta ePMP System Software Release 4.5-RC69 / 13-March-20

Any

The following article should help:

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=2ahUKEwje4IHpk7HoAhWDW80KHVBuCZQQFjABegQIAhAB&url=https%3A%2F%2Fhelp.ubnt.com%2Fhc%2Fen-us%2Farticles%2F204911324-airMAX-How-to-Reset-Your-Device-with-TFTP-Firmware-Recovery&usg=AOvVaw0opiNleuGhUB16lYHh12y4

Thanks,

Dmitry

i have the same problem, tfpt procedure dont work....

Initializing Upgradeerror