Dump the system's SPI image with Flash Programming Tool (ME thread), follow the cleanup guide and flack back followed by "fptw -greset" command.

That problem should have been detected and fixed at the shop, it will probably not be easy for you to fix it. Maybe even impossible without some HP software tools which reapply some board specific information and ME provisioning. Generally, HP is very annoying when it comes to ME 5MB firmware and motherboard alterations based on past experience.

Install the latest ME 11.0 driver from the ME thread and then run Flash Programming Tool with command "fptw -greset" which will reset the ME. Check if that helps. If it doesn't, try command "fptw -d spi.bin" but if you get "cpu access" error then things become a lot more complicated. If such an error is not shown, compress and attach the created "spi.bin" file.

The error you get is very descriptive and a clear indication of what you are doing wrong.

Your case is the same as seen here. The shop changed the motherboard and now the ME is unprovisioned with HP being very weird about it requiring their tools to do so etc. Read that thread and try whatever is listed there, maybe you'll get lucky compared to that person. Otherwise, I don't have anything else to add, everything I could possibly say is there.

The way I had understood the situation back then was that the BIOS would set the ME in recovery mode because the system was not provisioned as HP wants it. Since it happens after hardware changes (motherboard) it should be mostly BIOS related. The tests we had performed to clean+reconfigure the ME proved that. Also the fact that HP has some factory tools to do that provisioning but they are not available to end users, some links can be found at that topic you read and I refer to. Since in your case the motherboard got changed, you should be facing the same issues as the guy I linked above. From the ME standpoint, all you can do is what I said above (more detail). Everything else is HP/BIOS related and I had already tried to help in the other thread with no success because HP BIOS works in a weird/strict way. If you cannot even do the bare minimum of ME region cleanup, as instructed above, then try adjusting settings at MEBx but I doubt it will help.

Manufacturing mode Enabled means that the CPU/BIOS has Read/Write access to the SPI ME region (unlocked Flash Descriptor) and/or that the ME Manufacturing Done Bit (Global Lock) is not set.

Not necessarily. The Manufacturing mode depends on FD lock and/or Global Lock. I edited my previous reply with that information as well. As stated last time, if you cannot dump your firmware via "fptw -d spi.bin" then you cannot repair the ME firmware.