Shimano STEPS E8000 battery won't charge I have a STEPS E8000 bike and wanted to make some improvements, like possibility to charge from any kind of CC/CV charger (even using solar panels when grid is not available) and to charge it to 41v to improve cycle life but things went wrong after first brief charge. 

I charged(CC/CV) just a little from 40.3v to 40.6v when i observed that the battery level indicator is not working anymore.

The battery doesn't want to start at all and the Shimano charger is just blinking when connected, meaning some kind of error. 

Now i have 2 options: buy a new battery or find some Shimano service but i have no ideea if Shimano fixes a battery without warranty.

The second problem is that im not sure if a new battery will work wihout pairing/programming. 

Any thoughts why the battery(or BMS) got bricked when charging the cells directly and will a new battery work (plug'n'play)?
It looks like you might have bypassed the charge controller on the pack and charged the cells directly? The smarter pack controllers do a form of coulomb counting and will see anomalous or unexpected pack voltages as a risk and premptively brick. 

But before you get to that conclusion, I’d measure the individual cell voltages and make sure they are all within 0.1 volts of each other and that none are anomalously low. Balances often have a limited capacity for rebalancing and will brick a pack that is unbalanced too far. 

Finally if you want to repair the pack, you may find a new / used pack controller part on eBay or you might be able to scavenge off an older pack. But be aware some controllers do brick themselves at end of life so you might be SOL anyway. 

The worst case scenario is that you bricked the controller on the  pack and you can’t recover the controller. It’s not a huge loss. You can still break the pack apart and use the 18650 cells in other projects or sell them on eBay.