Add Caution

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superskybird
2021-03-31 11:05:30 +08:00
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@@ -16,6 +16,9 @@ To help and accelerate FIDO security key adoption, FEITIAN improves the housing
Before you try to program firmware to OpenSK, please read the original [OpenSK guide](https://github.com/google/OpenSK) at first. The following documents are most like additional remarks.
!!! warning "attention"
Before you try or buy Feitian OpenSK Dongle, please be sure that you have read the important [caution](./caution.md) message.
### OpenSK Model
We have two models of OpenSK USB Dongle, V1 and V2. They are designed according to the [nRF52840 USB dongle](https://www.nordicsemi.com/Software-and-tools/Development-Kits/nRF52840-Dongle), which is used by Google OpenSK firmware. The difference between V1 and V2 is the method to enter bootloader mode.