Anyone with an ET tester know how to get past this error at startup? None of the buttons (or shift-buttons) work. Also have reached out to the seller on AliExpress. Nothing in the manual and not finding on Google.
Figured this out, the 220v/110v switch at the back was set to 220v even though it included a US plug. Luckily I noticed this as the seller had no idea what was up. Once I switched it to 110v, everything was fine.
