1.Because of the OLT firmware which less than V1.9.7R not support change IPv4 to IPv6(via upgrade IPv6 OLT firmware). So pls upgrade the Intermediate version to help to change IPv4 to IPv6. There are the steps :

a) if OLT current firmware less than V1.9.7R, Upgrade V1600g1_upgrade_V1.9.7R_ipv4.ubi and reboot olt. when starting up then Upgrade V1600g1_upgrade_V1.9.7R_all_ipv6.ubi and reboot olt.

b)if OLT current firmware is or over V1.9.7R and already support IPv6, pls upgrade any IPv6 firmware provided by VSOL directly.

c)if OLT current firmware is or over V1.9.7R but not support IPv6, pls upgrade V1600g1_upgrade_V1.9.7R_all_ipv6.ubi or any ALLinONE IPv6 firmware provided by VSOL.


2.Version Information:
IPv6 OLT firmware including bootĄ˘Kernal and APP files. There are the firmware version in the following:

Boot: 
U-Boot 2018.08v1.1 (Aug 22 2018 - 09:49:40)

Kernal:
Linux version 3.6.5 (samson@ubuntu) (gcc version 4.7.2 (Broadcom Linux) ) #116 SMP Fri Apr 19 14:55:04 CST 2019

APP:
  Hardware Version:            eight gpon olt platform
  Software Version:            V1.9.7R
  Software Created Time:       Wed, 22 May 2019 11:41:33 +0800