Well I have had nothing but bad luck recently! First my Tinyhawk freestyle had a connector come off the AIO board and smoked the board as it came off. Anyway I recently bought a AIO Helio Spring v2 and a Helio Spring v2 well the first setup with AIO had a ton of video noise so I ditched the osd and connected VTX directly to camera. Worked fine for a couple days then my Diatone 4in1 esc just quit working not sure why looks perfectly fine. Anyway I decided to break out my old 4 Speedix 25a single esc with 4 new Talon 2207 2750kv motors and use the non AIO Helio with a PDB and it went together fine. Flashed newest IMUF and Emuflight firmware. Didnt make any major changes to settings just normal stuff OSD , and rates. Blah, blah blah sorry just venting! Well works great on bench but motors get warm quick. And when I installed props things got hairy! Everytime I arm it the drone tries to fly but makes weird motor sounds as it does. Checked CLI dump and nothing I set wrong and even tried trimming TX down but made it worse? Wt-? I have flying and building for a couple years so not really new to this but cant figure this one out and cant afford to buy anything else. New lipo got smashed the first time it went crazy. Like I said as soon as you arm it goes to about half or 1/3rd throttle and makes fluttering, pulsing sound, then flips over unless I disarm quickly. Not to mention this is my son's xmas present his first real fpv setup. Anyway sorry for the hundred million word post! Any advice or help would be great!

I'm sorry to hear of your woes.

This might sound like a silly suggestion seeing as you've been building quads for a few years, but you have definitely checked that the same each of the 4 motors is spinning in the in the correct direction haven't you? Use the motors tab to check that each numbered slider is spinning the same number motor as depicted on the diagram in the top left of that tab, and that each numbered motor is spinning in the same direction as shown on the same diagram. Also check that the props are fitted with the leading edge of the blades facing in the same direction as that motor is spinning.

I think we all go through a period where nothing goes right. I remember crashing 3 quads and wracking them all in one session. That was brutal.

I am pretty sure you will get over it and will continue with this hobby. Best of luck to you in future.

make sure you are using a protocol the esc can work with, and if not using dshot, calibrate the escs in betaflight. Make sure the board orientation is correct in betaflight (it moves how you move it in the 3d quad picture)