Correct, only specific models are supported:
- ADC-V515 on firmware version 0.0.5.096+
- ADC-V523/523X on firmware version 0.6.1.151+
- ADC-V723/723X on firmware version 0.6.1.151+
- ADC-V724/724X
- ADC-VC727P
- ADC-VC827P
- ADC-VC847PF
- ADC-VC838PF
- ADC-VC728PF
A guide to using onboard storage with SD cards can be found here: