All LEDs blink once a second right after connecting the power

Does anybody know what it means when all the LEDs of Mox (including RJ45 and G-module LEDs) start blinking once a second right after connecting power to it. Is this same as rapid blinking that identifies a HW issue?

This is how I received my Mox back from warranty “repair”, so I have no idea what Turris support/HW has done for it. I didn’t receive any message note or anything that it would be in some recovery mode or anything. This blinking just continues and Mox never starts up. It has microSD card that worked fine before me sending it to warranty repair. And I have tried to start it without each modules (SDIO and mpcie), but the blinking continues.