v1nc3nt wrote:Please, can you tell me if connecting GND and 3V3 of an wroom-32 is sufficient to trigger a boot? (I know, sounds stupid if the answer is yes, but I'm not an expert in soldering so it's kinda tough to decipher what's wrong...).
Not quite sufficient. You also need to pull up the EN (Enable) pin to 3V3. Consult the ESP-WROOM32 datasheet table 3.5.2 "Peripheral Schematics".
The chip might boot sometimes with the EN pin floating unconnected, but it will not boot reliably.
To do much more than boot (ie run ESP-IDF or connect to Wifi without browning out), the ESP-WROOM32 should have additional capacitors connected close to the 3V3 and GND pins, as shown on the schematic in the datasheet.