Originally Posted by genious_t
i have the same device as yours, flashed the wrong firmware and now ended up with no signals, IMEI = null and baseband = unknown under settings > about
if you still have that phone in working condition can you please help me with some partition dumps
Unfortunately I don't have the M8 any longer, and I've changed laptops since then too so I no longer have access to the original firmware for that device. Sorry, I wish I could help more.
You might want to contact one of the LRA carriers and see it they can provide it for you. A quick search came up with these that list some carriers.