Huawei YU220, Service Manual

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YU220 service manualV1.0
2013-10-18
Huawei secrets, no dispersion without permission
section needs please refer to your local service policy to decide
whether you need to rewrite the original IMEI, if not ask for
a change IMEI, then use
the original IMEI, this step can be
skipped. Please refer to the following specific steps guiding tool to
write numbers。
Write custom-tailor information ： Write lock network, national, and run the
business information. This section needs please refer to the
machine's original information operations, if the original version
without lock nets and other customized information, this step can be
skipped. Specific methods of operation please refer to the
following guidelines to write customized information.
RF calibration measurement: RF calibration and RF functional test, pass RF calibration
can make mobile RF performance to reach the best state; RF functional
test can detect whether the indicators of RF compliance. Specific test
methods can refer to measurement guidance and supply by other
document.
Mainrboard repair process description: mainboard repair process, please refer to the
host repair processes, the difference is that recognize it not need
to make the host MT test after fault repairing.
1.1 FLASHTOOL loading guidance （
half-erasure FLASH or whole
erasure FLASH
）
1. Open FLASHTOOL