This was already briefly discussed a few days ago in this thread here > https://bitcointalksearch.org/topic/trezor-change-firmware-5183023
According to the responses there by DireWolfM14 and BitCryptex it is not a mandatory update and if you want it you would have to precisely select that Bitcoin only firmware.
Topic: Sources Say “Orange Coin Good!” New Bitcoin-Only Firmware Now Available (Read 95 times)
September 11, 2019, 03:58:06 AM
September 10, 2019, 05:55:06 PM
According to Trezor:
https://blog.trezor.io/sources-say-orange-coin-good-new-bitcoin-only-firmware-now-available-47be0b611a4d
Quote
The community has spoken, and once again, we deliver! We are thrilled to announce that the beta version of our new Bitcoin-only firmware is now available to download for both Trezor One and Trezor Model T. We aim to introduce a stable version of Bitcoin-only firmware in the next month’s release.
From now on, we will be producing four different versions of firmware — regular (full altcoin support + U2F/WebAuthn) and Bitcoin-only, for both Trezor One and Model T.
We have created a customized version of both our firmware and Wallet designed for everyone who supports the idea of Bitcoin. Every Bitcoin maximalist can now enjoy the Wallet interface with nothing else but Bitcoin. All the features of Trezor One and Model T available just the way you like it; Bitcoin only.
From now on, we will be producing four different versions of firmware — regular (full altcoin support + U2F/WebAuthn) and Bitcoin-only, for both Trezor One and Model T.
We have created a customized version of both our firmware and Wallet designed for everyone who supports the idea of Bitcoin. Every Bitcoin maximalist can now enjoy the Wallet interface with nothing else but Bitcoin. All the features of Trezor One and Model T available just the way you like it; Bitcoin only.
https://blog.trezor.io/sources-say-orange-coin-good-new-bitcoin-only-firmware-now-available-47be0b611a4d
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