netinstall detects wrong architecture

hi to all . i got a strange problem today .i have 3 RB2011uias-rm and all of them stock in etherboot mode . i used netinstall and misbe arch so 2 of them fixed but the third one detects smips in netinstall page as the package while i know that rb2011uias-rm is in misbe architecture . what could be the problem . thanks

The RouterBOOT is not updated, probably still 3.x instead of 6.x

You must upgrade the RouterBOOT by serial console (search instruction on old wiki) the correct firmware is inside the right .npk, open it with 7-zip or similar and explore the “etc” folder.