Garmin answered:
The following steps are used to restore the software of a Tacx Trainer.
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Open TTA on a mobile device.
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Connect the trainer.
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With TTA open in the background open the firmware restore link.
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Select ‘‘Set Up Trainer’’ or just click the trainer.
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Select Firmware Update.
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Select ‘‘Update Now’’ to update the trainer.
Please use this link here →
tacx[dot]page[dot]link/?link=https%3A%2F%2Fapi[dot]tacxtraining[dot]com%2Fdevice-api%2Fv3%2Ffirmware%2F70ZR8LGNV3AljwIt9Ab4YC&apn=tacx.android&isi=1575884075&ibi=com.garmin.tacxtraining
I’ll have to try