Pax A920: Android System Recovery - Keyboard... | terminalfaults.org

Technical Background:

The Pax A920 utilizes an Android-based operating system with a custom overlay for payment processing functions. The recovery mode is a separate boot environment used for system updates, data wiping, and debugging. Booting into recovery typically requires a specific key combination during startup or may be triggered by corrupted system files or a failed over-the-air (OTA) update. Attempting to install a custom keyboard may lead to system instability if the keyboard is not compatible or properly signed, or if the system process interrupts critical system processes.

Symptoms:

Device is booting into Android System Recovery mode instead of the standard operating system. The user query suggests a desire to install a custom keyboard.

Possible Causes:

Accidental key press combination during boot.
Corrupted system files due to power interruption during an update.
Failed or incomplete system update.
Attempted system of an incompatible or unsigned application (keyboard).
Software conflict caused by a previously installed application.
Low battery voltage during boot process causing memory corruption.

Solution:

1

Perform a soft reboot: Hold the power button until the device shuts down completely. Wait 10 seconds, then power it back on. Observe if the device boots normally.
2

If the device still enters recovery mode, attempt to 'Reboot system now' option from the recovery menu. Use the volume keys to navigate and the power button to select.
3

Clear cache partition: If rebooting fails, navigate to 'Wipe cache partition' in the recovery menu (using volume and power buttons). This will remove temporary files that may be causing the issue. Do not wipe data unless absolutely necessary, as this will erase all user data and installed applications.
4

Check the battery level: Ensure the device is adequately charged. Connect the device to its power adapter and allow it to charge for at least 30 minutes before attempting to reboot.
5

If the problem persists, contact Pax support or your payment processor's technical support for further assistance. Do NOT attempt to flash custom ROMs or modify the system software yourself, as this may void the warranty and compromise the security of the device.
6

Safe Handling: Disconnect power if the device is unresponsive before contacting support.
7

Document the steps taken and results for support to reference.

Safety Warning:

The Pax A920 is a PCI-PTS certified device. Do NOT attempt to open the device casing or tamper with internal components. This will trigger anti-tamper mechanisms, rendering the device unusable and potentially compromising sensitive data. Static electricity can damage electronic components. Avoid handling the device in environments with high static electricity. Ensure proper grounding when handling the device. Always perform Safe Handling: Unplug the device before inspection or cleaning.

Prevention:

Ensure a stable power supply during system updates. Use a surge protector to prevent power fluctuations.,Avoid installing applications from untrusted sources. Only install applications from the official app store or from verified sources recommended by Pax or your payment processor.,Regularly check for and install system updates provided by Pax or your payment processor.,Train staff to avoid pressing unnecessary keys during boot-up.,Keep the device's charging port clean and free from debris to ensure proper charging.

Expert Tip:

If the device consistently boots into recovery mode, and clearing the cache partition does not resolve the issue, there may be a corrupted boot partition. Try booting into 'Safe Mode' (if available - consult the Pax A920 manual for the specific key combination). Safe Mode loads only essential system applications, which can help identify if a third-party application is causing the issue. If Safe Mode allows the device to boot normally, uninstall recently installed applications one by one to identify the culprit.

Frequently Asked Questions

•Does a factory reset affect PCI compliance?

A factory reset can impact PCI compliance. Consult your security team and payment processor before performing a factory reset to ensure proper re-keying and security protocols are followed.

•What is the correct procedure for updating the device firmware?

Firmware updates should only be performed through the official channels provided by Pax or your payment processor. Follow their documented instructions carefully.

•What are the ESD precautions for this terminal in a retail environment?

In dry environments (especially during winter), ESD is a risk. Ensure the terminal is placed on a static-dissipative surface. Advise staff to ground themselves before touching the terminal, especially after handling synthetic materials.

Pax A920: Android System Recovery - Keyboard Installation Diagnostic

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•Does a factory reset affect PCI compliance?

•What is the correct procedure for updating the device firmware?

•What are the ESD precautions for this terminal in a retail environment?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: