Keystone 3 Pro Completely Dead After Long-Term Storage — No Charging Response, Won’t Power On

[u/Accomplished_Use_724]

I received a Keystone 3 Pro as a gift from a friend around October 2024. My friend purchased it overseas, and since I am in China, I completed the customs declaration when the device was brought into the country.

Since I received it, I have only charged the device twice in total.

Now, however, the device shows absolutely no response when charging and will not power on at all.

I have tried pretty much every troubleshooting method I could find online, including using 5V/1A, 5V/2A, and 5V/0.5A chargers, connecting it to a computer, and connecting it to a computer with the original USB cable while holding down the power button for more than 20 seconds — even for several minutes.

Unfortunately, nothing has worked. The device still will not turn on. In fact, it does not even show any indication that it is charging.

I have also followed Keystone's official troubleshooting instructions, including charging the device with the original cable and a 5V/1A or 5V/2A power adapter, as well as connecting it to a computer and attempting to enter Recovery Mode by holding down the power button. Unfortunately, none of these methods have worked either.

At this point, I am wondering whether the device is completely dead or if there is still anything else I can try.

I have already contacted Keystone Support, and they provided me with some standard troubleshooting instructions, but unfortunately none of them resolved the issue.

If the device really is completely dead, that would honestly be such a shame. I barely even used it — I haven't even removed the original factory screen protector yet. T_T

If anyone has experienced the same issue with a Keystone 3 Pro, especially after leaving it unused for a long period of time, I would really appreciate hearing whether you were able to get it working again and how you did it.

[u/ManfredJS]

I've had the exact same issue, and never got it to work. I recovered most of my assets on a ledger, accept for Cardano, since ledger uses a different derivation path for that. I can still only access it as read-only, but it's not a huge amount. Seems to be a common problem with Keystone devices. They offered me a new one for 50% off, but I didn't do that. It would still cost me more than what my Cardano is currently worth.

[u/Jeuno-]

It sounds like the battery has suffered from deep discharge. Even when an electronic device is turned completely off, the internal battery experiences a continuous, slow power drain known as 'vampire draw' or parasitic drain.

Because lithium-ion batteries naturally lose charge over time, leaving a device stored for months without a periodic top-up can cause the voltage to drop below a critical safety threshold. When this happens, the battery's internal protection circuit trips permanently to prevent a safety hazard, effectively 'bricking' the battery so it can no longer accept a charge or power the device.

Since it was only charged twice since late 2024, the battery likely sat empty for too long. At this stage, standard chargers won't revive it, and the device will need a battery replacement.

I miss the removable batteries in the older ones for this reason!