If the Raspberry fails to connect the hotspot board, please try update the firmware of the hotspot board by conducting the command: sudo pistar-mmdvmhshatflash hs_hat More info pls view: amateurradionotes.com/pi-star-notes.htm#hotspotfwupdate Compatible with P4 settings: Method 1: Remove the R1 resistance of the hotspot board(single/dual) ; Method 2: Cut off the 2 Raspberry Pi pin headers on the corners of the board ( pick one to operate on your MMDVM board, refer to the product image for the R1 and 2 pin headers locations) Features High efficiency, less power comsumption, High quality TCXO, stable, low BER Support Raspberry Pi 3B, 3B +, Pi ZERO, compatible with NanoPi NEO, Orange Pi, compatible with BlueDV (requires USBtoTTL or Bluetooth model) Support MMDVM mode DMR / YSF / P25 / NXDN / DSTAR / POCSAG Support online upgrade, User-friendly OLED and Nextion special design location, reserved for additional installation of Bluetooth modules Package List 1x MMDVM motherboard(UHF/VHF)Compatible with P4 settings:since our mmdvm board is defautly setup for Pi-Zero W, Pi 3. and if you do want to connect it with your Pi 4, you could try below methods. PICK ONE. Method 1: Remove the R1 resistance of the hotspot board(single/dual) ; Method 2: Cut off the 2 Raspberry Pi pin headers on the corners of the board ( pick one to operate on your MMDVM board, refer to the product image for the R1 and 2 pin headers locations). If the Raspberry fails to connect the hotspot board, please try update the firmware of the hotspot board by conducting the command: sudo pistar-mmdvmhshatflash hs_hat. More info pls view: amateurradionotes.com/pi-star-notes.htm#hotspotfwupdate. Hotspot board saves electricity, High quality TCXO, stable, low BER. Support MMDVM mode DMR / YSF / P25 / NXDN / DSTAR / POCSAG. Support online upgrade, User-friendly OLED and Nextion special design location, reserved for additional installation of Bluetooth modules. AURSINC hotspot board supports Raspberry Pi 3B, 3B +, Pi ZERO, compatible with NanoPi NEO, Orange Pi, compatible with BlueDV (requires USBtoTTL or Bluetooth model). MMDVM hotspot supports UHF VHF, frequency range: 144MHz-148MHz, 420MHz-475MHz, 842MHz-950MHz (depending on ADF7021 and TCXO, HAT firmware amateur radio brand license restrictions).
