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! 
Anyone had an issue where each time you enter turbo it blinks then shuts the light off?
I don’t know what did the heat do to the driver but whenever it enters turbo it will blink once then shuts the light off.
Tapping it once will enable the turbo back but it no longer steps down until it drains the battery dry
Mine kinda did stuff like that after I made it a triple. I’m not sure about the stepping down part but high amps seems to mess with the driver. Sorry I’m not much help but at least give a bump to the thread.
Suspect my driver defect now after one year usage.
Very dim light and unable to switch mode.
I tried plug in two 3V battery to see any different. Its bright by around 30 lm.
Guys, do u think its driver or LED defect? As I plan order new driver from BG
:person_facepalming: You have fried the driver
I want to attempt the spring mod but these directions are not clear.
I thought at first I was just soldering a wire from one spring end to the other. After looking into it more, it appears that I’m going to have to remove and resolder the switch and one end of the wire goes on a certain switch arm.
Now I’m very confused.
Does someone have a detailed guide on how to do the spring mod?
I’ll just put this here for comment. It’s been an interesting first couple of weeks with my first BLF A6 XPL. Out of the box, it didn’t work. I noticed the head, fully tightened, didn’t even start to cover the O-ring, and it it rattled. I naively just tightened the threaded retaining ring. It only took 1/16 turn, but the rattle stopped, and it worked!
The head still wasn’t covering the O-ring on the body tube, and the retaining ring had to be tightened every time I unscrewed the head (all 3 times).
So, a few days ago, I finally loosened the retaining ring a half turn and tried to center (it was way off) the driver, and it went down a mm or so. I re-tightened the ring, and it works much better now. Now the O-ring is completely covered, so it’s probably much more waterproof.
I realize that’s a pretty minor issue, but it was frustrating, and I had a hard time getting to like this light. Another reason only enthusiasts and not the average consumer are the target market.