CHANGELOG: add note about BackupData.length
Forgotten in
@@ -8,6 +8,7 @@ customers cannot upgrade their bootloader, its changes are recorded separately.
### [Unreleased]
- Allow arbitrary input sequence numbers (fixes compatibility with Taproot transactions in Sparrow wallet)
+- The BackupData.length field is now obsolete and always set to 0
### 9.12.0
- Ethereum: add support for EIP-712 structured data signing
