Solution: Checksum of the Security settings in the EFI Variable is not correct. Enter ThinkPad Setup to check security settings, Press F10 and then press Enter to restart the system. If you still have a problem, have the computer serviced.

Message: 0187: EAIA data access error

Solution: The access to EEPROM is failed. Have the computer serviced.

Message: 0188: Invalid RFID Serialization Information Area

Solution: The EEPROM checksum is not correct (block # 0 and 1). The system board should be replaced, and the box serial number needs to be reinstalled. Have the computer serviced.

Message: 0189: Invalid RFID configuration information area

Solution: The EEPROM checksum is not correct (block # 4 and 5). The system board should be replace, and the UUID needs to be reinstalled. Have the computer serviced.

Message: 0190: Critical low-battery error

Solution: The computer turned off, because the battery is low. Connect the ac power adapter to the computer and charge the battery, or replace the battery with a fully charged one.

Message: 0191: System Security - Invalid remote change requested

Solution: The system configuration change has failed. Confirm the operation and try again. To clear the error, enter ThinkPad Setup.

Message: 0199: System Security - Security password retry count exceeded.

Solution: This message is displayed if you enter a wrong supervisor password more than three times. Confirm the supervisor password and try again. To clear the error, enter ThinkPad Setup.

Message: 0251: System CMOS checksum bad - Default configuration used

Solution: System CMOS has been corrupted or modified incorrectly, perhaps by an application program that changes data stored in CMOS. The BIOS installed Default Setup Values. If you do not want these values, enter Setup and enter your own values. If the error persists, check the system battery or contact your dealer.

Message: 0271: Real Time Clock Error - Check Date and Time settings.

Solution: BIOS found date or time out of range and reset the Real-Time Clock. May require setting legal date (1991-2099).

Message: 1802: Unauthorized network card is plugged in - Power off and remove the network card.

Solution: The network card is not supported on this computer. Remove it.

Message: 1820: More than one external fingerprint readers are attached.

Solution: Power off and remove all but the reader that you set up within your main operating system.

Message: 2000: ThinkVantage Active Protection sensor diagnostics failed.

Solution: ThinkVantage Active Protection sensor is not working correctly. Have the computer serviced.

Message: 2100: Detection error on HDD0 (Main HDD)

Solution: The hard disk is not working. Have the hard disk serviced.

Message: 2101: Detection error on HDD1 (Ultrabay HDD)

Solution: The hard disk is not working. Have the hard disk serviced.

Message: 2102: Detection error on HDD2 (Mini SATA)

Solution: The Mini SATA device is not working. Have the Mini SATA device serviced.

Message: 2110: Read error on HDD0 (Main HDD)

Solution: The hard disk is not working. Have the hard disk serviced.

Message: 2111: Read error on HDD1 (Ultrabay HDD)

Solution: The hard disk is not working. Have the hard disk serviced.

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Lenovo 20AA000BUS, T431s, 20AA000MUS manual Troubleshooting computer problems

20AA, T431s, 20AA000MUS, 20AA000BUS specifications

The Lenovo ThinkPad series has long been a favorite among business professionals and tech enthusiasts alike, and the Lenovo 20AA000BUS, 20AA000MUS, and T431s models exemplify the brand's commitment to innovation, performance, and rugged design. These laptops are designed for enterprise users who require reliability and versatility in their everyday tasks.

The Lenovo 20AA000BUS model features a robust Intel Core processor that ensures smooth multitasking and quick application launches. Paired with a generous amount of RAM, users can easily run demanding applications and simultaneously manage numerous browser tabs without a hitch. The full HD display provides sharp visuals and vibrant colors which enhance productivity, whether one is working on spreadsheets, watching videos, or conducting presentations.

In terms of connectivity, these models boast several USB ports, HDMI output, and an SD card reader, which facilitate seamless integration with various peripherals and external devices. With the inclusion of robust wireless options, including Wi-Fi and Bluetooth, users can stay connected throughout their workspaces and collaborate effortlessly with coworkers.

Security features are a priority for Lenovo, and the 20AA000MUS model does not disappoint. Built with a fingerprint reader and a webcam privacy shutter, users can feel confident in their data safety. Lenovo's Trusted Platform Module (TPM) technology further enhances system security by encrypting sensitive data.

The T431s, a prominent model in this lineup, prides itself on its sleek and lightweight design, making it easily portable for professionals on the go. The carbon fiber and magnesium alloy chassis not only lends to its durability but also ensures that it withstands the rigors of daily travel.

Battery life is another highlight of these models, capable of lasting through an entire workday, which is a significant advantage for users who often find themselves away from power sources. The Quick Charge feature allows for rapid recharging, ensuring that users can quickly power up their devices before heading into meetings or events.

Overall, the Lenovo 20AA000BUS, 20AA000MUS, and T431s represent a blend of advanced technology, user-centric design, and robust security features. They stand out as reliable companions for professionals seeking efficiency and performance in their computing devices. Whether in the office or on the move, these laptops meet the demanding needs of the modern workforce.