Bluetooth version supported in Espruino - 4.0, 4.2, 5.0?

it is built in wrong way, it has type "bootloader"

$ nrfutil pkg display espruino_2v04.105_mdbt42q.zip

DFU Package: <espruino_2v04.105_mdbt42q.zip>:
|
|- Image count: 1
|
|- Image #0:
   |- Type: bootloader
   |- Image file: espruino_2v04.105_mdbt42q_app.bin
   |- Init packet file: espruino_2v04.105_mdbt42q_app.dat
      |
      |- op_code: INIT
      |- signature_type: ECDSA_P256_SHA256
      |- signature (little-endian): 71d5aef62a8a7833e13994a17ecb8397235fe0eebe0d74251f17ffb7d9db2bf053336828d7a814777e337e5246d34246badb7ff90e86793937af96ce3fd936a0
      |
      |- fw_version: 0x00000000 (0)
      |- hw_version 0x00000034 (52)
      |- sd_req: 0x8C
      |- type: BOOTLOADER
      |- sd_size: 0
      |- bl_size: 308148
      |- app_size: 0
      |
      |- hash_type: SHA256
      |- hash (little-endian): 0985a61291d7d45f0becc9b69a60b773bdd951466121225d9697606a97a217ce
      |
      |- boot_validation_type: ['VALIDATE_GENERATED_CRC']
      |- boot_validation_signature (little-endian): ['']
      |
      |- is_debug: False

here are some different fields from previous application packages

      |- fw_version: 0x000000FF (255)
      |- type: APPLICATION
      |- boot_validation_type: []