I thought that in the current models (the Trezor 1 and the Trezor Model T), whether it is bitcoin ONLY or multi-coin is a kind of a software setup. So when you initially set up the device, you can choose whether to set up for bitcoin only or for multi-coin.. and if you want to change back to the other, then you have to erase the device and start over.
Or maybe I am wrong.. in the older devices it is firm ware, but the firmware can still be changed back and forth, no?
So now, in the newer version, there is a kind of difference in the hardware that the consumer has to choose which one and cannot elect how to set it up after receiving it?
Trezor currently releases 4 firmwares for its wallets: 2 for Trezor one and 2 for Trezor T. Firmware only for Bitcoin and firmware for all other coins can be reinstalled at will.
The process for installing Bitcoin-only firmware is different from installing regular firmware. You must first download the firmware only for Bitcoin to your computer, here are the installation instructions:
I think that with Trezor safe 3 (the usual model for all coins) everything will be similar and it will be possible to install both versions. And the Trezor safe 3 bitcoin only version model will have the ability to install firmware only for Bitcoin.