Let me ask you a question. My BlackBerry can't turn on the machine now. The red light flashed four times, then again after a pause, but I took the battery down, pressed the circuit board several times and put it back on. In fact, the flashing red light of BlackBerry is a binary code when it is turned on, and it is'1'and' 0' when it is off, which is used to indicate some states of the current mobile phone:

Initialize 1 system (mfi)

1 1 has no operating system.

10 1 operating system Crc check failed.

1 1 1 The Crc check of the operating system is lost.

The operating system path of 10 1 1 is missing.

1 10 1 The operating system has no digital signature.

111The operating system signature is invalid. If the battery can't be reloaded first, then install it in the factory or change the font library.

10 10 1 unknown flash manufacturer, new font library.

10111font analysis problem, numerical duplication or font replacement.

11011font deletion failed. Please copy the value or replace the font.

11101font operation is out of range.

1111/bootrom CRC check for incorrect duplicate values or replace fonts.

101011USB driver error.

1011kloc-0/bootrom has no crc check.

101111font library failed to write duplicate values or font library.

The memory configuration table 1 10 1 is invalid.

The password of11kloc-0/1is not authorized.

11101/ram initialization problem duplicate value or font library.

1111cache flag is not empty.

11111Invalid cache tag type.

101010/random number failed.

101011operating system storage failure.

101101security initialization failed.

1011101NAND flash memory failed.

General input and output fault of11kloc-0/1

11011runtime library failed.

110111undefined instruction.

111011Pre-reading terminated.

111101data aborted.

111110/reservation.

11111/interrupt request

10101kloc-0/1quick interrupt mode' it is normal when the red light flashes once; Otherwise, please try to refresh the machine!

Your situation belongs to "11101Cache flag is not empty".