HI, i have this modem and i want to install openWRT on this
as you can see it have a mt7628 processor
16MB ROM
64MB RAM
and a 4g modem in usb internal port
can i install it with the modem working
What is the brand + model of your device?
Did you look for this unit on the firmware selector or the table of hardware?
If the unit is not listed, it is relatively unlikely that anyone will work to add OpenWrt support for it due to the 64MB RAM. This is the bare minimum required for 25.12 (current stable release) and it is expected that the nexdt major release will require 128MB RAM, making any support very short lived.
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it is a no brand modem
i tried instaling with the zbt we 1226 and i didnt have succes it rejected
tried to have acces to the root, but the mtd code not working
i extracted de firmware
it have 7MTD´s
That makes it even more unlikely that you'll find current support for the device (every device requires its own bespoke firmware image based on the low level hardware design). And it also makes it extremely unlikely that anyone will add support for it (especially given the 64MB RAM issue I mentioned earlier).
Since you have the device, you are welcome to try to add support by diving into the development process -- links below (and just to set expectations, it is a near certainty that nobody else will do this work, so if you're so inclined, this stuff will get you started):