Hey All!
So I recently purchased two Linksys E7350s from the refurbished Woot deal with the plan of installing OpenWRT on them. Long story short Woot/Amazon screwed up, refunded me the whole order, but still shipped me two Range Extender 7350s.
So, my question is, does this model support OpenWRT? I know Linksys rebrands stuff as Belkin, but I couldn’t find anything in the TOR for the Linksys model. I’m going to guess the answer is “no”, but I’m happy to tear one open and pull UART from it.
No, this device doesn't appear to be supported.
Adding support would likely require the typical "add new device" process -- the UART angle to gather bootlog and other info would certainly be an important starting point. If you can ID all the relevant chips, that's also key.
Side note: I have an E7350 in my lab at work, and I was considering getting one from that deal to have as a spare, but it seems like I might not have gotten what was originally advertised anyway.
x https://techinfodepot.shoutwiki.com/wiki/Linksys_E7350_v1
mt7621 is fairly supportable.
This was the device the OP had hoped to get (and purchased via a Woot deal). This is already well supported. But they were sent something else -- the RE750 which doesn't appear to be supported.
Board pictures here: https://photos.app.goo.gl/KvfaoCN6rHr32VpW6
Looks to be a Qualcomm IPQ6000 CPU. Spending some time checking the other chips.
All chips here
https://fccid.io/K7S-08270/Internal-Photos/Internal-photos-5055049.pdf
Full list of chips:
Qualcomm IPQ6000 - CPU
ESMT M15T2G16128A - RAM
Qualcomm QCN5021 - 5Ghz Radio
Qualcomm QCN5052 - 2.4Ghz Radio (I think?)
Qualcomm QCA8072 - Gigabit Ethernet Controller
MXIC MX30UF1G18AC - Flash storage
U&T UTG24P05 - Ethernet Magnetics Module
LOL welp guess I wasted all that time tearing it apart 
Firmware>
https://support.linksys.com/kb/article/3529-en/
ie binwalk it, chop out 10 devicetree DTB-s, dtc them into dts, try to find similar device, attach serial and try to netboot starting with ipq6xxx random but similar device initramfs kernel.
Thats GIGA-bit, ie 128MB, still a lot for OpenWrt.
Insert “I understand some of these words” meme here
Kind of starts with running linux....
Looks like this commit is for a similar device, sharing the same CPU, radios, and ethernet controller. Might be helpful in providing a head start…
Thanks. I’ll try to tftp boot or whatever this image for this device and see. I also am building a custom factory image using the OpenWRT build system with all of the supported hardware drivers. Hopefully it’ll boot.
First would be to back up flash from oem bootloader.
What’s the best way to back up the existing flash?
I believe I’ve identified the UART output on the board and am going to start prodding at it with my TTL serial adapter.
Break bootloader timeout, likely pressing "any key" during countdown, in uboot console type help, printenv, uboot guide is in wiki or where u boot is made.
Learn before doing.
Looks like 256 MB RAM, combined with ipq60xx that's a hard no-go.