How to build firmware when multi-user decentralized management is required
not supported, so you can't, at least not easily.
32mb RAM kind of a dead end too.
8M flash 32M RAM
Increased minimum hardware requirements: 8 MB flash, 64 MB RAM
Due to new features being introduced and the general size increase of the Linux kernel, devices now need at least 8 MB of flash and 64 MB of RAM to run a default build of OpenWrt.
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I still run some devices with 8/32, on current master with 5.10. So it's possible, but you'll have to fine-comb through the options in the build configuration to manage to get an image to fit with just the requirements for that specific deployment.
Oh, and forget about running luci/uhttpd, unless you want a whole other layer of pain.
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Thank You ! 
No intention to wake up an old threat. Only I wanted to mention I have your router and works totally fine with the firmware made for the Nexx WT1520F (8M of flash, 32MB ram) running the latest openwrt 22.03.5 https://openwrt.org/toh/nexx/wt1520?datasrt=firmware%20openwrt%20upgrade%20url
Cheers,