Several different OpenWrt 19.07.10 firmware builds for routers:
TP-Link TL-WR741ND V4
https://mega.nz/folder/1dgCDSjB#hbwnC4MR9On2MfQxchyhAg/folder/lchSwTKQ
D-Link DIR-615 E4
https://mega.nz/folder/1dgCDSjB#hbwnC4MR9On2MfQxchyhAg/folder/8EwEnR4K
Squashfs block size: 256 KB