Don’t know if this will solve your issue, but I also had problems with my original Apple cables. The FLX4 has higher Power Delivery (PD) specs (5 Volts, 3 Amps) than many older Apple devices; so your Apple cables may not be up to spec. I have 4x original Apple USB-C to Lightning cables that work fine with my Apple devices, but only 1x works with the FLX4.
Some Things to Look for in a Cable:
- USB-C to USB-C cables that can handle 3 Amps and also handle high powered chargers (18, 20, 60, 65 watts etc.).
- USB-C to Lightning cables with an MFI rating. An MFI rating means the cable uses Apple circuitry in the cable and is certified by Apple.
- I don’t recommend using the Apple Camera Connection Kit. Use a USB-C to Lightning cable to simplify the setup.
CABLES/CHARGER THAT WORKED FOR ME:
I recommend the brand UGREEN as I’ve had good luck with them. Similar cables/chargers from Anker would also probably work. And of course, original Apple cables with the higher Power Delivery specs.
UGREEN USB-C to USB-C Charging Cable
UGREEN USB-C to Lightning Cable
UGREEN USB-C to Lightning cable
UGREEN USB-C GaN Charger
