How do I fix a new Rejuvacare device that shows error 77 when plugged in?
Answer
Try one simple charging setup: the original USB-C cable into a basic 5V 1A USB wall adapter, not a fast charger, laptop port, or high-power block. Many 77 errors on a new unit clear when the power source is reduced to a standard low-power adapter.
Before you start: stop right away if…
- Do not force the device to charge on a damaged cable or an adapter that overheats.
Follow these steps
Unplug and note when 77 appears
Unplug the device, wait about 30 seconds, then plug it in again and watch whether 77 shows immediately or only after some time.
You should see: You know whether the code is immediate on power or delayed.
Use the original USB-C cable
If you have the cable that came with the Rejuvacare device, use that cable only for this test. Set aside third-party or damaged cables for now.
You should see: The device is connected with the original or best-matching USB-C cable.
Switch to a basic 5V 1A wall adapter
Plug the cable into a simple 5V 1A USB wall adapter. Do not use a fast charger, laptop USB port, power bank boost mode, or high-wattage USB-C PD block for this test.
You should see: The device is powered from a low, standard USB adapter.
Charge and watch the display
Leave the device connected for several minutes and watch whether 77 clears, stays, or changes to a normal charge indicator.
You should see: Either the error clears and charging looks normal, or 77 remains with the simple setup.
If 77 remains, contact the seller or support
If the code still appears with the original cable and a basic 5V 1A adapter, stop further charger experiments and contact the place of purchase or Rejuvacare support with the model and that you see 77 on first plug-in.
You should see: You have a clear warranty or replacement path if the simple charging test fails.
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Extra tips
What to look for: Whether 77 appears immediately on plug-in, which cable and wall adapter you are using, and whether a basic 5V 1A adapter changes the result.
Before you change anything: Have the original USB-C cable nearby if it was included. Use a basic USB wall adapter rated about 5V 1A, not a fast charger. Note whether the 77 code appears right away or only after charging for a while. Stop if the cable, adapter, or device feels hot or smells burnt.