The release notes for 1.4.10.06 state that an upgrade to 1.3.5.x should be done first. However no such update exists. Current boot code is 1.0.0.12 and image is 1.0.8.3. It wants an .stk file but new format is .ros. Boot images for larger switche...
Apparently the SG200 8-port models, including the P, have a different code base than the larger SG models, hence the lack of boot firmware and image compatibility. This is also why the SG200-08x uses .slk images as opposed to .ros images. Therefore...
Note, a normal TAC case is not possible as Small Business systems don't have support contracts. I did find a copy of the 1.3.5.x image and boot image at the following location (Zip File):Downloads Home - Switches - LAN Switches - Small Business - Sm...