DIY extender battery for Jam2 Shimano doesn't work anymore

merlot

Member
Apr 27, 2021
23
7
ES
Hello,

After updating firmware on my Jam2 Shimano (2018), my DIY extender battery has stopped working.

Before that, just after plugging the Rosenberg connector in the charging port the bike turns on and you can drive using that external battery, although you don't get information about its SOC on the display.

Now, after upgrading from 4.3.3 to 4.3.4 the bike does nothing.

Anyone has experienced this behaviour?

Do you know how to downgrade?

Thank you
 

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