Sony has advised owners of North American PlayStation Portables not to install the Japanese 2.00 update.
Although the update will happily install on US PSPs, with few problems reported, Sony will only be able to offer customer support once it has been officially released in the USA - something that will happen sometime in the future.
European PSPs will ship with the 2.00 update pre-installed.
The Japanese Sony site that allows anybody to download the update file has been updated since its release on Wednesday with the following warning for owners of non-Japanese models:
"CAUTION: This update is only for customers who obtained PSP (PlayStation Portable) for Japan which model number is PSP-1000 or PSP-1000 K. Upon completion of preparing, we will announce update information for the other countries/areas customers via SCE Group Web Site or other channels. For theses customers who obtained PSP in the other countries/areas, please DO NOT update PSP through this web site."