Hello,
It seems you are talking about the flash that the RCM6700 has? Digi has the serial flash patch at the below link, with this patch it does not give flash issue.
http://ftp1.digi.com/support/documentation/40002882_B.zip
OR You can use the latest version of Dynamic C 10.72A, the below is the download link
https://www.digi.com/support/downloads/index?NRYgT33Fl5aFmRxfIpkhhjynGCWT3kjZAq9XWKmbkpMk0sxfBtG29VnRnWMtuP1l
Thank you.