fix was to send a new battery that had the old firmware...but they do not have any more.

Edit to clarify--the batch of batteries that shimano CS now possess all have the latest FW. as stated earlier in the thread, those in the retail channel likely have older FW. i suspect shimano CS had stock of some batteries with the older FW in late july/early august, but those are now gone.

Yep...I thought I would try it anyway, since I have another battery. I'm curious if the post firmware recharging cleared it. Both batteries were still under warranty. Worst case I could throw them at the doors of Shimano on one of my rides...:)

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"Most of my heroes don't appear on no stamps"
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i think you experienced a coincidental but unrelated issue. charging the battery would not have anything to do with the issue reported earlier in this thread. you are not mixing and matching 6770 parts (derailleurs, shifters, control box) with 6870/9070.

FYI--QBP, the largest parts distributor, is now out of BTR2 until late august. i'd wager that any new batteries that arrive will have the latest FW.

if you're affected by this issue (inadvertent upgrade), your best bet now is to get hold of a battery that has been sitting in the retail channel for a little while.

When will sequential shifting make it from XTR over to 6870 and 9070? Any ideas?

i'm bumping this thread as i noticed something new. on their e-tube information site, shimano now has warning at the top of the page and a compatibility chart (PDF) this topic. i believe both have been added in the last week or so.


"When any device which is not shown in E-tube compatibility chart is connected, all components don't work. Confirm the E-tube compatibility chart."


This took me a bit of head-scratching to really understand, but once it did it tells a few important things.

a) 10s and 11s FDs & RDs can never be mixed....but it appears that any shifter may be used with either a 10s RD/FD pair or an 11s RD/FD pair.

b) EW67 is really only "incompatible" with the internal battery BTR2. seems dumb. most users would be able to switch from EW67 to EW90. external battery-based systems are not impacted.

c) mixing groups appears to be fine -- e.g., one could use the forthcoming MTB rear shifter SW-M9050-R with ST-9070-L, if i'm reading the chart right. (you can use 6 shift units.) that's kind of neat for me as i hope to use one of the new MTB clutch RDs for a 1x cross setup. one could not use a road FD and an FD-M9050, though.

so....still annoying but not as sinister as things first appeared. breaking compatibility between EW67 & BTR2 seems weird.

Tetonrider,

Thanks for all of your help. On my bike I was using the EW67 with the internal battery BTR2 causing my shifting not work. Pretty stupid in my opinion.

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