Should you encounter issues an issue when upgrading from HelixNet version 4.0 to 4.2.7 where the 4.2.7 firmware file cannot be validated, it is advised to upgrade in incremental steps:
...
Should you encounter issues an issue when upgrading from HelixNet version 4.0 to 4.2.7 where the 4.2.7 firmware file cannot be validated, it is advised to upgrade in incremental steps:
...