but the max value is 1008mhz , Cortex A9 is 1,2Ghz.
when i'm take wipe data/cache on fastboot mode always is <waiting for device>
i do it when tablet is in recovery .
in recovery i have this option :
apply update from ADB
apply update from external storage
apply update from cache
update rkimage from external storage
wipe data/factory reset
wipe cache partition
recovery system from backup