[dkirker]

So... I mucked with my first MC7700 and screwed it up. So definitely be careful with flashing firmware and switching modes. I managed to get my MC7700 into MBIM mode, and apparently stuck in an inoperable state (it shows up, but doesn't accept commands -- so if someone knows how I can revert this, I would really appreciate it!!). I am not even sure that MBIM mode is supported by the MC7700, so.... ooops! So definitely be careful! I bought a second MC7700 off of eBay, so I think I am back up and running. For some reason my Lenovo T420 doesn't like something with the mPCI-E connector, so I can't really work with the new one in my laptop.... :/

[Grabber5.0]

That stinks! I had to try a couple of my laptops before I found one that it would work in. I tried an older Core 2 Duo HP laptop, and with the modem installed, the screen wouldn't work! I had to open up my newer laptop, which fortunately had an open mini-PCIe slot so I didn't even have to remove my WiFi module. I left out the best part - I got the modem for $18 with free shipping!

[mazzinia]

So... I mucked with my first MC7700 and screwed it up. So definitely be careful with flashing firmware and switching modes. I managed to get my MC7700 into MBIM mode, and apparently stuck in an inoperable state (it shows up, but doesn't accept commands -- so if someone knows how I can revert this, I would really appreciate it!!). I am not even sure that MBIM mode is supported by the MC7700, so.... ooops! So definitely be careful! I bought a second MC7700 off of eBay, so I think I am back up and running. For some reason my Lenovo T420 doesn't like something with the mPCI-E connector, so I can't really work with the new one in my laptop.... :/

About the T420 , did you put the whitelist free bios ?