QCC3003做USB升级，升级后比升级前少了很多PSKey的值

似火年华

各位大佬:
QCC3003做USB升级,升级内容只是升级audio_prompts.xuv的部分，升级成功后发现PSKey里USER8-USER32的值都被清空了，这个是怎么回事，附上升级内容如下：
device_variant QC3003
# Set the upgrade version and previous version(s)
# that are compatible to upgrade from. The minor
# version can be '*' to act as a wildcard.
upgrade_version 2.1
compatible_upgrade 1.*
compatible_upgrade 2.*
# Set the ps config version and previous version(s)
# that are compatible to upgrade from (hex values)
ps_config_version 2
ps_prev_config_version 0
ps_prev_config_version 1
# Filesystem containing audio prompts
1 2 audio_prompts.xuv