My bike has an older Dura-Ace 9070 drivetrain with the external BTR1 battery and EW90-B junction box on the stem. I want to update the firmware. Can I do this with a BCR2 computer interface? I understand that it won't charge the BTR1 battery and that's fine; I just want to update firmware and tinker with the Di2 settings.
I will probably change the battery to an internal one at a later date and add the WU111 wireless unit. For now I just want the latest firmware.
Discuss light weight issues concerning road bikes & parts.
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