RBR50 and RBS50 disable 5ghz backhaul and / or 5ghz wifi all together

50Litres wrote:

Cabling it permanently is not the solution, I could throw these out and go another brand for the install cost.

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It might be a process of elimination finding a mesh system that can handle the brick wall / metal building issue.  i.e.,

• Buy one.
• Install it.
• If it doesn't work any better, send it back.
• Start over with another.

Rather than use a physical Ethernet cable, other users have substituted something that appears to the Orbi as a cable, but is in fact something else.  Such as:

• MoCA.  (https://en.wikipedia.org/wiki/Multimedia_over_Coax_Alliance )  If there happens to be an existing coax cable that connects the main building and this portable building, a pair of MoCA adapters can provide a connection.
• Power-line (https://en.wikipedia.org/wiki/Power-line_communication ) is another technology that many users have used.  If the main building and the portable building are fed from the same electrical panel, then a pair of Power-line adapters can create a communication link.  Power-line adapters are available in all sorts of performance levels. A pair of TP-Link PA9020 units, for example, sells for under $100 on Amazon.
• Wireless Bridge.  If you can drill a hole through the metal wall to mount an antenna outside, then a pair of wireless bridge units can create a network link.  (Search Amazon for "wireless bridge point to point".)  There are many models under $100.  Because these units are rated in terms of kilometers, the unit in the main building can be mounted indoors and will blast through the house with no problem.  The metal building walls may prove too much, forcing that unit to be attached to the outside of the building.  Many of these units are powered using the Ethernet cable (PoE), so the hole through the portable building wall would be less than 1/2" in diameter.