Hi, welcome to gurus.
Flashed mifis and how long they last are entirely dependent on who is doing the flashing, I mean you get what you pay for, some of us have devices still out there and still working from more than 2 years ago, others not so much maybe only a few months or less, but a mifi is your solution I think.
I am not sure what you mean by " I'd buy a 6620L (only device that unofficially works with my OS) " so not sure how to answer that.
I do have LTE service available also its not as cheap as the 3g but is much faster and we have it cheaper than you can get it from the carrier for, any way if you want a good 3g flash that will last there are still a small few of us doing them that know what we are doing so be careful choosing . good luck!
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