upgrading t500 with aftermarket wwan

[Lord-Soth]

Hi, i'm getting the same issue that i got before in my x300 ...
and i'm looking for a "whitelist" sollution for this thing (i don't get it in any other laptop other than lenovo's ... )

i've got a sierra mc8781 card which works pretty well and i'm interested in putting it inside my t500 ...
but i'm getting the famous 1804 error ...

is there any "fix" out there already ? or something like zenders bios ?

thanks for a fast reply/