Ps-22a.bin

| Start | End | Likely content | |-------|-----------|----------------------| | 0x0 | 0x3FFFF | Bootloader (U-Boot) | | 0x40000| 0x4FFFFF | Kernel (zImage) | | 0x500000| end | Root filesystem |

grep -r "password" rootfs_extracted/ grep -r "telnet\|ssh\|serial" rootfs_extracted/ Warning: Modifying ps-22a.bin can brick the device. Always back up original. Replacing a file in SquashFS: unsquashfs rootfs.bin # edit files in squashfs-root/ mksquashfs squashfs-root/ new_rootfs.bin -comp xz -b 256K Rebuilding full firmware: Concatenate modified parts: ps-22a.bin

unsquashfs -d rootfs_extracted rootfs.bin If JFFS2: | Start | End | Likely content |