ALLNET RockM.2Extendv1.6
Rock Pi e.g. with 2 extend boards

Works with both versions ROCK PI 4A/ 4B
The new M.2 Extension Board v1.6 has been improved based on community feedback.
Improvements:
Gold-plated connectors for stable data transmission
In the previous version, the connectors were simple FPC connectors. They could easily break and the ribbon cable could be installed incorrectly. Not only do the connectors prevent the cable from being incorrectly inserted, but they also have a lock to prevent the connector from moving.
Improved ribbon cable with mounted gold-plated connectors on both sides
The previous ribbon cable was always the subject of discussion. There were complaints that the cable did not ensure stable data transmission because the connection via the FPC connector was not precise and good enough. They also said that interference could occur because ground wires were not used for insulation within the ribbon cable.
Both issues have been addressed. Not only does the cable now have gold-plated connectors on both sides, the layout also pays close attention to shielding between the high-speed data lines. An intelligent arrangement ensures that no data is lost. The connectors have additional springs to ensure a stable connection even when the board is moved.
The only disadvantage now is the fact that the cable length can no longer be easily adjusted with replacement cables.
Redesigned interface card for the M.2 connector of the Rock Pi 4.
The assembly of the M.2 board with simultaneous use of the EMMC has been improved.
The product includes:
M.2 expansion card
Mini PCB adapter for connecting to the on-board M.2 socket
Heavy-duty ribbon cable
Mounting bolts and screws