I have a RB260GS (marked CSS106-5G-1S). Full reset gives me 2.7p. Tried upgrading to 2.18 and switch is unreachable afterwards. Straight after upgrade it works fine, but after powerloss is not reachable anymore. Shows up in Winbox as 2.18, but cannot connect. Tried upgrading using both the “auto upgrade”, and uploading bin manually. Any ideas? Hardware failure?