Recertification needed if we change stack from BLE to thread in nrf52840

[Yagnik_pokal]

We have certified the Centauri gateway with https://fccid.io/2AKNO-VOLCT200LTE ID. Now We have a query that we used nrf52840 chip as a BLE during certification.

Now on this Centauri we want to use Open thread stack on nrf52840, Is it allowed to update this BLE chip FW stack with Open thread FW stack?

Both BLE FW stack and Open Thread FW stack uses IEEE 802.15.4 standard and 2.4 GHz frequency.

Does updating the FW stack on BLE chip leads to any re-test/re-certification?

[ketiljo]

The modulation is different for 802.15.4 compared to BLE. So the bandwidth, band edge power etc will be different. It will be necessary to do the FCC testing again. A permissive change is maybe possible.