IROAD V9S2 products which were manufactured from August 2016 to January 2017 have some issues.
[Recall corresponding serial number] The first four digits of the 13-digit serial number
1671 / 1677 / 167F / 167N / 1689 / 168K / 168T / 1692 / 1699 / 16A1 / 16A9 / 16AK / 16AP / 16BN / 16C2 / 16C9 / 1719 / 171K / 1728
[How to check the serial number]
IROAD V9-S2, Check the bottom at the back of the product