AnyTone AT-D878UV / D578UV: common problems, care and updates

AnyTone is a different class from the budget "Chinese" radios: the D878UV (handheld) and D578UV (mobile/vehicle) have long been a popular choice among DMR enthusiasts for their rich feature set, GPS, Bluetooth and good sensitivity. But there is one detail that shapes the whole logic of caring for them: AnyTone firmware is closed, there are no open sources, and no OpenGD77-style alternative exists for this platform. So here we don't pour in "custom" firmware or tweak the calibration by hand — all the work comes down to sensible use, careful official updates and targeted repair of the parts that wear out mechanically.

Updating the firmware: step by step, without rushing

The update itself is not difficult, but it requires discipline. Here is the procedure for the D878UV (for the D578UV it is almost identical, only the button combination to enter the bootloader differs):

1. Download the package for your model from the official AnyTone resource or a trusted dealer. The archive contains the firmware (a .spi file), the CPS and a changelog. Make sure the CPS version in the package matches the firmware version.
2. Make a backup. In the CPS, read the codeplug from the radio (Read) and save the file. This is your insurance.
3. Put the radio into update mode (the bootloader). On the D878UV, hold PTT and the top PF3 button together and switch the radio on; the red LED will start blinking — the radio is in write mode. On the mobile D578UV you enter write mode by holding PTT and PF1 while turning it on.
4. Flash it. Open the manufacturer's update utility (in the CPS — the Tools → Firmware Update menu), select the .spi file, choose the correct COM port and press Write. Wait for it to finish without touching the cable or power.
5. Perform an MCU reset. A reset is mandatory after flashing: turn the radio off and back on while holding PTT and PF1; the screen will show "MCU Reset, Please Wait" — do not switch the radio off until the procedure is complete.
6. Load the codeplug. Write your saved codeplug back using the new (matching) CPS.

Freezes and firmware glitches

The most common "complaint" about AnyTone isn't a hardware failure at all. Random freezes, oddities in the menu, the radio "lagging" or rebooting — almost always these are quirks of a particular firmware version or a corrupted codeplug built on an old CPS.

• First step — fresh official firmware. AnyTone regularly releases updates that fix exactly these bugs. Update following the instructions above, and most "glitches" go away.
• Second step — a clean codeplug. If the radio misbehaves after an update, do a full reset and load the codeplug again with the correct CPS rather than carrying the old file over "as is".
• Don't fix a software problem with a soldering iron. Before opening the radio up, rule out the firmware version and the codeplug — in 9 cases out of 10 they are the cause.

GPS won't "lock" or won't turn on

GPS in the D878UV/D578UV is a separate module, and problems with it come in two kinds. Software ones: GPS is simply disabled in the settings, or it needs a "cold start" under open sky — the first satellite acquisition after a long idle period takes minutes, and indoors there will be none at all. Hardware ones are rarer and almost always linked to interference inside the unit: there are known cases where GPS stopped working after a DIY repair because of a severed or unsoldered ribbon cable during reassembly.

• First check that GPS is enabled in the menu and in the codeplug, and let the radio sit outside for the first acquisition.
• If you recently opened the unit up — check the GPS module's ribbon cables and connectors, they are easy to pinch during reassembly.

Battery and contacts

On the handheld D878UV, power runs through spring-loaded contacts between the battery and the body. Over time they oxidise, with the classic symptoms: the radio shuts off on transmit, the charge indicator "jumps", and it comes back to life if you press the battery with your finger.

• Clean the contacts — isopropyl alcohol and a cotton swab; carefully remove the oxidation spots without scraping off the gold plating with sandpaper.
• Gently bend the spring tabs for a tighter press — literally by fractions of a millimetre.
• Only the factory charger. The manufacturer warns explicitly: use the original charger; an unsuitable one may cause failure and even fire. Short-circuiting the battery contacts is dangerous — it gets very hot.

The antenna socket, buttons and encoder

Mechanics are one of the few things on an AnyTone that really do wear out and can be fixed at home. Three parts suffer most often.

• The SMA antenna connector. An antenna over-tightened at an angle loosens the socket, and you get an intermittent connection: receive/transmit drop out until you press on the connector. Fixed by re-soldering the mounting pad on the board, or in a bad case by replacing the socket.
• Buttons and PTT. The tactile micro-switches eventually develop "bounce" (one press = two activations) or stop pressing. PTT wears out first. Fixed by flushing the contact group with alcohol or replacing the micro-button.
• The encoder (volume/channel knob). On the handheld D878UV the knob is a potentiometer/encoder, which from dust and wear starts to "jump" and switch to the wrong setting. Flushing with contact cleaner often helps; with heavy wear it is replaced with an equivalent.
• Quiet audio or microphone. Sometimes people complain about weak volume or quiet transmit — first check the settings and the headset socket (the contact group disconnects the built-in speaker when an accessory is plugged in), and only then suspect the speaker/microphone.

Don't touch the frequency calibration by hand

We'll stress this separately: the factory frequency and power calibration in AnyTone is set at the factory using measuring instruments and stored in a service area. Going in there "by eye", without a frequency counter/analyser and without understanding what you're doing, means driving the radio outside the permitted band and ruining its transmit parameters. If you think the radio has "drifted off frequency" — it almost certainly isn't the calibration, but either the firmware/codeplug or even normal operation, verifiable with a reference instrument rather than another radio.

Cleaning, storage, accessories

• Cleaning. The body — with a slightly damp cloth, no harsh chemicals; contacts and sockets — with isopropyl. Keep the rubber connector caps in place, they protect against dust and moisture.
• Storage. Li-ion keeps best at room temperature and around half charge; don't leave the radio overnight on a makeshift charger unattended.
• Accessories. Use original or proven batteries, antennas and cables. As with other DMR radios, cheap cables with a counterfeit chip are a frequent source of driver trouble when programming an AnyTone; a cable with a genuine FTDI saves you from messing about with the COM port.