刷机时显示ramote：remote: size too large

C:Usersmpc20Documentsplatform-tools-latest-windowsplatform-tools>fastboot flash boot BOOT.IMG
target reported max download size of 532676608 bytes
sending boot (33249 KB)...
OKAY [0.789s]
writing boot...
OKAY [0.163s]
finished. total time: 0.963s

C:Usersmpc20Documentsplatform-tools-latest-windowsplatform-tools>fastboot flash system SYSTEM.IMG
target reported max download size of 532676608 bytes
erasing system...
OKAY [0.016s]
sending sparse system 1/7 (516360 KB)...
OKAY [ 13.417s]
writing system 1/7...
FAILED (remote: size too large)
finished. total time: 13.462s

C:Usersmpc20Documentsplatform-tools-latest-windowsplatform-tools>

肿么解决？（fastboot flash –S 256M system SYSTEM.img，这指令也用过了，一个结果。）