hi guys, i bought a couple of these beacons

1. is it possible to reprogram them via a jlink?
   2)can you tell me a jlink to buy that is not too expensive?
   I would like to program these beacons with Mycropython or with Espruino.
   3)It's possible?

Someone know if exist a usb nRF52840-dongle (with external antenna ) to plug into a raspberry to scan nearby tag?

Hello everyone,
I'm looking for a usb device (with external antenna to widen the beam) with which to scan BLE ibeacon. The usb device I would like to connect it to a raspberry pi 3b +
If it were possible, the device should be compatible with the hcitool command, as I use a hcitool-based presence tracker software