@Lazar-Demin
Have the v0.1.9 b149 with oupgrade imported and am with the Omega2 in the onion cloud again online. Thank you Demin

Great Markus Schuss after some try is then succeeded with the downgrade to
omega2p-v0.1.5-b135.bin is the onion again online and the problem "fixed". Property the firmware version up to the latest "omega2p-v0.1.8-b145.bin" and only version the @Markus Schuss specified has worked with me.
So I can continue to work with the Omega2 until then a newer firmware solves the problem.