ESP32 Firmware versions

The firmware versions are:-

Firmware name	WiFi	Ethernet	Bluetooth	PSRAM(Large heap)	ESP32 version
WROOM_32	✔️			✔️	0 -> 3
WROOM_32_BLE	✔️		✔️		0 -> 3
WROOM_32_V3_BLE	✔️		✔️	✔️	version 3 only
ESP_WROVER_KIT	✔️			✔️ 2Mb heap + Graphics	0 -> 3
EP32_PICO	✔️		✔️		0 -> 3
ESP32_LILYGO	✔️	✔️	✔️		0 -> 3

WROOM_32

Default version which supports all ESP32 versions but doesn't support Bluetooth BLE due to memory constraints in the IRAM section caused by PSRAM fixes for version 1 chips.

WROOM_32_BLE

Same as the WROOM32 but drops PSRAM support to include Bluetooth BLE

WROOM_32_V3_BLE

This version is specific to ESP32 V3 and includes all support including PSRAM and Bluetooth.

ESP32_PICO

Specific to ESP32 Pico. Same as WROOM_32_BLE but with a changed serial link speed.

ESP32_LILYGO

Specific to LILYGO boards. Same as WROOM32_BLE but also includes Ethernet support.