Tried all that many times. It does nothing to change the mode setting gs on my light.
I checked & tried everything. It is stuck with next mode memory and can not access any hidden modes or the batt check at all.
It sounds like your capacitor is either not draining at all or incredibly slowly. That means the driver always thinks you “short-pressed” (to use TK’s terminology) no matter how long the light was off.
looks like i got a dud…
I am about to trash this pile of junk. checked over the driver solder connections, switch connections, everything is ok. it is just stuck without any hidden modes, and has only next-mode memory and cant change it. I also broke off the tip on my snap ring pliers trying to get that threaded driver loose, and ended up scratching up the threads using pliers to get it loose. It looks nice, but a flashlight that has only next-mode memory and not work as its supposed to is a waste of money no matter how pretty it looks. 
Probably a dumb question…but where’d you get the light from?
From the GB link in the BLF A6 topic.
Ahhhh…well….i would hope you could get them to do an exchange. I was wondering if there might have been a chance of a “fake”…but sounds doubtful.
not worth an “exchange”, to ship the light back to china would cost 4 times its worth.
Dbsar we know you have modding ability, why not ask banggood (or neal directly) for them to ship a mew driver to you?
Prolly more fun to put it in front of a bullet. Try hitting it end on for a challenge. Personally I would try for a driver swap but then I don’t own a .300.
The major problem with the first batch was bad soldering in the head assembly. My problem — getting into the configuration mode — got “fixed” after BG sent me a head assembly replacement without sending in the head assembly as with many others.
I did send a note through Banggood about the defective driver, but have not heard back yet.
its a nice light, but hate the next-mode memory its stuck in. Its disappointing too to receive such an anticipated custom light that supposed to be perfected to our design & wishes, but to get only a defective one.
This one for problem solving. Its permanently fixed properly. 
I know this is an A6 thread but I recently bought an Astrolux S41 which if I understand correctly uses the same driver. The light worked fine for a week then all of the sudden it started stepping down through each mode after a few seconds until it shuts off and its as if mode memory turned itself on as well. I figured it was low voltage protection so I tried a fresh cell, same thing. I am using EagleTac 16340 and Soshine 18650 cells. I do not have any unprotected cells to try as I just prefer protected ones for safety. It worked great for a week though on both cells and others have used protected cells with no issues so I doubt thats the problem. Both driver and tailcap switch retaining rings are tight and I also tried bypassing the tailcap completely with the same issues. Any ideas on a fix?
Now the driver in my BLF A6 is stuck in low mode. (wont change modes at all)
Banggood said there were going to send me a new driver, but don’t know when.
Funny, but I have a similar driver issue where there are two dim modes, a bright mode, and what appears to be a turbo mode. Pressing 15+ times the light goes off, then no blinks then after a period comes on in a dim mode. Took driver apart and connections looks good per picture at beginning of this thread. Contacted BG and sent two videos, described here, and they responded with a comment
We are sorry for the inconvenience and I checked the video.But it is not very clear.Can you please check the modes according to this link: ~toykeeper/flashlight-firmware/trunk : contents of ToyKeeper/blf-a6/blf-a6.txt at revision 249 And we suggest you also check the retain ring on the tail cap and head.Make sure the switch could could working normal.
I responded that all is checked, and described the issue again suggesting they show the vids to Neal or heyanquing, and we shall see…
Something in the driver logic is not apparently triggering or the firmware is corrupted.
I have two of these lights that work fine….for the price (now $19) they work amazingly…My hat is off to the designers
Update: They sent a new driver…apparently it takes a bit of discussion, driver installed and back to good again! The new board is apparently a bit smaller diameter and has a tab on one edge to hold it under the brass clamp ring. A little strange, but it works!
I heard when you said shipping back to China was too darned expensive !
Well, at least they are willing to send you a driver. Better luck than I had with Banggood who sent out a new Klarus Mi7 with turbo mode DOA. I FINALLY got another USA based Klarus vendor that offered a new head from their inventory.
Klarus in Europe, or where ever they are, reimbursed them.
Now that ’s warranty service. Banggood NOT so much.
The new replacement driver arrived today from Banggood for my BLF A6, (shipping was quick) and installed the new drover and it works perfectly! 