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B-2.0 (BTC-Only)

BTC-Only firmware B-2.0 includes the updates below:
1. Keystone now supports Casa, a key management protocol, in multi-signature wallet mode.
2. The labeling of the firmware versions scheme has changed. M-x.x stands for "Multi-cion firmware" while B-x.x stands for "Bitcoin-only firmware".
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Instructions recommended:
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