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Carlinkit TBox Ambient (Tbox Max): Chips, Codes, Firmware
Carlinkit TBox Ambient hub: tell the SM6225, SDM660 and QCM6125 versions apart, engineering codes, firmware builds, accessories and bug reports.
Specifications
- Chipset (SoC)
- SM6225 (QCM6225) / SDM660
- Android
- 13
- RAM / storage
- 4 GB / 64 GB, 8 GB / 128 GB
- Variants
- Tbox LED (SM6225), Tbox USB (SDM660, extra USB port), QCM6125 (early units, as reported)
- How to tell it apart
- Sold by Carlinkit as the Tbox Max, also known as the Ambient: LED lighting on the top of the case, Android 13. The SDM660 version has an extra USB port; the SM6225 version does not.
- Official pages
- SupportFirmware downloads
Identify your unit
The TBox Ambient is the Carlinkit box with LED lighting on its top. Carlinkit now sells it as the Tbox Max and states on the product page that the two names mean the same device. It runs Android 13 and comes with 4/64 or 8/128 GB.
Three hardware versions exist, and each takes different firmware:
- SM6225 (QCM6225), sold as Tbox LED. The common one since late 2023.
- SDM660, sold as Tbox USB. Same idea with an extra USB port for external devices. It shares firmware with the SDM660 TBox UHD.
- QCM6125, early 2023 units. The forum firmware lists show these taking TBox Plus EAU builds.
Open Settings → About and read the processor line before you download anything. The which TBox do I have page compares the Ambient with the Plus, UHD and Ultra.
Engineering menu & codes
Open Settings → Other → Factory settings and type a code on the keypad:
- 4545: factory menu. The 4 Dec 2023 build added a start-up delay of 0 to 20 seconds here, which helps when the car does not see the box after you start the engine (car doesn’t detect the AI box). Under Other you also find the navigation bar switch and the temperature display.
- 166888: audio settings, including 44.1 kHz. Tap Save and wait for the reboot.
- 110144: clears the cache after an update before you consider a reset; see factory reset after a firmware update.
The full list, with what each setting does, is in the engineering codes table.
Firmware
Carlinkit’s download page (Support → Downloads on its own website) lists separate files for the Ambient LED and for the Ambient and UHD on SDM660. The firmware request page explains how to ask support for a specific build. This site does not host or link firmware files.
Install with the FOTA app from a FAT32 microSD card, following update TBox firmware with FOTA.
| Firmware date | Chip | Android | What changed, as reported |
|---|---|---|---|
| 4 Dec 2023 | SM6225 | 13 | Fixed hangs and resets when updating with a third-party launcher set as default; start-up delay added to factory settings. |
| 15 Dec 2023 | SM6225 | 13 | Further sound-quality fixes; LED on/off restored after the 12 Dec build broke it. |
| 23 Apr 2024 | SM6225 | 13 | Flagged by the forum as not recommended: Android Auto broke. Fixed in the 25 Apr 2024 build. |
| 27 May 2024 | SM6225 | 13 | Official release, shared with the UHD: fixes for no 4G after a slow car connection, no sound on 4G calls, high CPU load after connecting with Bluetooth off; new settings screen. |
| 1 Apr 2025 | SDM660 | 13 | Ambient and UHD SDM660 build listed on Carlinkit’s download page. No change log. |
| 11 Nov 2025 | SM6225 | 13 | The owner who later lost the SIM reported no SIM problems up to this build. |
| 3 Sep 2026 | SM6225 | 13 | Newest build owners discussed. No change log. |
On builds after November 2025 one owner found the box no longer saw the SIM after a restart, and rolling back to a 2025 build fixed it at once; see TBox Ambient loses the SIM after 2026 firmware. The complete list is in the firmware tracker.
Accessories that matter
- Y-cable. Reboots under load, with a SIM, or only in one car usually mean the USB port cannot supply enough current. Start with AI box keeps rebooting.
- Cooling. The SM6225 runs warm in summer. Switch on the temperature display (4545 → Other) and read overheating shutdowns before you stick a heatsink to the case.
- FAT32 microSD card of 32 GB or less, for local updates and recovery files.
- Data SIM. If mobile data disappears after the car has stood overnight, see no mobile data after idle.
How to report a bug
Before contacting support, note:
- The processor and firmware date from Settings → About.
- Car make, model, year and head unit, and the protocol (CarPlay or Android Auto).
- Which build you came from, if the fault started after an update.
- A short video of the fault.
Write to [email protected]; hours and other channels are on the Carlinkit T-Box FAQ. The cross-brand checklist is on how to report a bug.
Known issues and guides for this device
Generated from every article tagged with this device, most-confirmed first.
Power & connection
Car offers only Android Auto, or the box vanished after a mode change? Press the box's mode button 2–3 s or use the microSD file. Carlinkit TBox, Ottocast.
16 confirmed reports
Head unit ignores your AI box until you replug it? Set a start-up delay of 10–30 s so the box waits for the car. Carlinkit TBox, ApplePie UX999.
11 confirmed reports
AI box rebooting or dropping out under load, with a SIM, or after app updates? Feed it from a second USB port with the Y-cable. Carlinkit, Ottocast, UX999.
7 confirmed reports
Heat & throttling
AI box freezing or shutting down from heat? Add a heatsink or magnetic cooler, a fan, or move it into vent airflow. Carlinkit Ultra, Ambient, Picasou 3.
10 confirmed reports
Is your AI box too hot? Show its CPU temperature (4545 → Other) and act above about 80 °C, where throttling starts. Carlinkit TBox, Picasou 3 Pro.
4 confirmed reports
Box lags, overheats or loses touch on a huge car screen (Geely Atlas)? Set Smallest width to 800 or switch to Android Auto. TBox Ambient, Plus, Picasou 3.
4 confirmed reports
Audio & calls
Forcing 44.1 kHz (code 166888) helped some TBox Plus and Ultra 2 owners but caused crackle, silence or reboots for others. How to test it and undo it.
11 confirmed reports
Stutter, crackle or thin sound after moving your AI box from CarPlay to Android Auto? Factory reset the box. Carlinkit TBox Ambient, Plus, UHD and Ultra.
10 confirmed reports
Music or navigation crackles or sounds muffled through your AI box? Turn off voice-assistant hot-word and reboot. Carlinkit TBox Ultra, Ambient, Plus.
9 confirmed reports
Incoming calls silent through your AI box? Reset Bluetooth to one phone-box pairing, or route calls via the head unit. Carlinkit TBox Ambient, Ultra, Plus.
8 confirmed reports
Callers can't hear you through your AI box? Clear stale Bluetooth pairings, turn off assistant wake phrases, limit mic access. Carlinkit TBox, UX999.
8 confirmed reports
Car radio stops when your AI box connects or speaks a prompt? Set the alert app to lower audio, not take over. Firmware notes for Carlinkit TBox and UX999.
7 confirmed reports
A 1–2 second call delay through an AI box is normal; echo for the caller is not. Take calls on the head unit's Bluetooth. Carlinkit TBox, Ottocast Nano.
4 confirmed reports
Firmware & recovery
Bruxe, DuDu or CarCar firmware misbehaving on a Carlinkit TBox? What each changes, what owners saw break, and how to return to stock with update.zip.
10 confirmed reports
Local firmware update for Carlinkit TBox Plus, Ambient, UHD and Ultra with the FOTA app and a FAT32 microSD card, step by step, plus fixes when it fails.
10 confirmed reports
TBox Ultra won't boot? Flash Carlinkit's official recovery package with QFIL in EDL mode: Flat build, SM6350 firehose, UFS. Plus fixes for Sahara errors.
8 confirmed reports
Glitches after a TBox firmware update? Clear the cache with code 110144 first, factory reset only if errors stay. Carlinkit TBox Plus, Ambient, Ultra.
5 confirmed reports
TBox Ambient or UHD sees the SIM only on first boot after a 2026 update? Set physical SIM in CloudSIM, disable the cloud SIM, or roll back to a 2025 build.
5 confirmed reports
QR code or Device not activated after a Carlinkit update? Get the box online with a SIM, then email the QR to Carlinkit support. TBox Plus, Ambient, Ultra.
4 confirmed reports
Updating an AI box with CarCar or another launcher as default can end in a black screen. Switch to the stock launcher first. Carlinkit, Ottocast, Ownice.
2 confirmed reports
Firmware update fails after a multitouch or gps.conf mod over ADB? Run adb enable-verity, reboot, then update. Carlinkit TBox Ultra and Ambient; root too.
2 confirmed reports
SIM, Wi-Fi & GPS
Position jumps, lags or no GPS fix on your AI box? Turn on Google Location Accuracy and check the OEM GPS switch. Carlinkit TBox Plus, Ambient, Ultra.
15 confirmed reports
SIM shows signal but no mobile data on your AI box? Turn on data roaming, then enter the APN by hand. Carlinkit TBox Ambient, Plus, Ultra; Ottocast.
11 confirmed reports
AI box hotspot off after every start? Make a MacroDroid macro or use CarCar Launcher's auto-modem option. Carlinkit TBox Ultra, Ambient, MGears Mstick4.
10 confirmed reports
Exclamation mark or 'no internet' on your AI box while apps still load? Turn off Android's captive-portal check over ADB. Carlinkit TBox Ultra, Ambient.
6 confirmed reports
No mobile data when your TBox Ambient starts after a night parked, until you restart it? Toggle airplane mode, or add a start-up delay in 4545.
5 confirmed reports
Apps & launchers
CarCar Launcher asks for a licence again after a factory reset or reflash? Scan its QR code from the account that bought it. Licences stay with one device.
7 confirmed reports
AI box screen glares at night? Switch to a dark theme, lower the launcher's white point, and stop the theme flipping back to light. Carlinkit, Ottocast.
6 confirmed reports
Make the car's voice button open Gemini, Alexa or another assistant on your AI box: set it as Digital assistant app. Carlinkit TBox Ambient, Plus, Ultra.
5 confirmed reports
YouTube shows a playback error after a few seconds on a Carlinkit TBox? A factory reset or an alternative client worked; cache and reinstalls did not.
5 confirmed reports
Music or navigation apps lose their login, or offline downloads vanish, each time the box starts? Add a launch delay in your launcher. TBox Ultra, Ambient.
2 confirmed reports
Hide the left navigation bar on Carlinkit (4545 → Other) or Ownice (1260 → Other), turn off the floating button in Display, or disable it over ADB.
2 confirmed reports
Carlinkit home-screen panes are widgets, not split screen. Make a real two-app split with code 121212 or the floating button. TBox Plus, Ambient, Ultra.
2 confirmed reports
Endless "Loading phone" after installing CarCar, Nova or another launcher? Turn off the system navigation bar (4545), set it as default. Carlinkit, Ownice.
2 confirmed reports
ADB, root & tinkering
Turn on ADB on a Carlinkit TBox (code 142618 or wireless debugging) or an Ottocast Picasou (port 65535 / 29528), connect, and switch it off again safely.
17 confirmed reports
No pinch-zoom on your TBox in Android Auto? Check your firmware, then add one build.prop line over ADB without root (Ultra, Plus) or patch the Ambient.
11 confirmed reports
Root a Carlinkit TBox Ultra or Ambient: back up boot_a/boot_b (init_boot on Ambient) with QFIL, patch in Magisk, write back, and how to undo it fully.
8 confirmed reports