Zisa OP-151S modify SquashFS - help CRC calculation

[centaur]

This script shows the location and function used to calculate the CRC for all 3 locations in the firmware.

kovalenko/SFP-GPON/blob/master/makeimg.sh

Original openwrt topic for this module:

Support Zisa OP151S GPON ONU Lantiq SFP module

Hi i got a Zisa OP151S SFP GPON . this SFP module is based on lantiq falcon gpon. How i can adapt the firmware and update it? the linux shell show Openwrt 12.09 version but i dont know how to update it because when i upload last version says that isnt valid. i got the original firmware and im going to dump the gd25q64 chip. anyone can help? we can support this module ?