Good news everyone! Stable firmware for LightningAsic controllers is underway, it should be ready for public in the coming week and it will be possible to upgrade (from v1, v2, v2.1..) by uploading it to the upload page. The firmware .bin will be released for public, but it is compatible only with LightningAsic controllers. Upgrading from factory Tp-link 703N will not work and it might brick your Tp-link, so don't even try!