i migrated my Zigbee and Thread Network to the MR4U. OLD: SLZB-06MU and an self flashed ESP32-S3+ESP32-H2 OTBR NEW: SLZB-MR4U with native OTBR (SLZB-OS 3.2.6.dev0) Zigbee on CC2674P10, Thread on EFR32MG26, OTBR native on the slzbOS. Integrated in my existing Apple Thread Network. with the IEEE duplication and some tweaks in zigbee2mqtt i migrated my whole zigbee network with 138 devices. Great Product, great Support!