They just put out a GPL drop here, with reflashing instructions and docker support.
I see they are offering jobs and bug bounties
There were a few cve's in lede. But the currently exposed attack surface in this product is low. I do wish there was a tftp update method, but at least jtag and the emulator will make it much faster to modernize. Finding a near equivalent of this board already in the openwrt universe is on my mind... ?
https://downloads.openwrt.org/snapshots/targets/mediatek/mt7629/
https://downloads.openwrt.org/releases/21.02.1/targets/mediatek/mt7629/
Only device is the mt7629 reference board in snapshots and 21.02.1