Backstory:
So little backstory, the company I work for require 100s of monitoring stations all over and they all run on cellular modems, I thought I would cheap out and buy cheap Chinese modems. And whilst they work, after looking into them more in depth, I don't trust them with any of the data, or any of the IPs of the corporate servers they're going to be calling into. And the reason why I'm trying to figure this out is cause I've got 100s sitting in a box at work pretty much e-waste, so I'm going to go to pretty far extents to try to get these things reliable and secure.
Question:
Would I be able to flash/load the firmware of an open source project on to it, to re-gain security back on the modems, I've looking inside and it's an ARM Processor with a cellular card installed (Quectel EC25-A)
Here is also a few phones if your curious about the config: https://imgur.com/a/ssuq1kt
The model is the USR-G781 (I'm not posting links cause I'm even sketched out about their website)
Thanks everyone
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