This invention discloses a method for upgrading telecommunication devices, which takes NE example as a unit to upgrade devices, in which, a NE example includes at least two working regions, namely, an original edition working region and a new edition working region, said method includes: a, setting up a temporary working region in the NE example, b, copying the data of the original edition working region of the operation service needing upgrading in the NE example to said temporary working region, c, upgrading the data of said region, d, copying the upgraded data to a new edition working region in the NE example, e, switching the service flow to a new edition working region from the original one and deleting the temporary working region. This invention also provides a device used in upgrading telecommunication devices and an upgraded engine unit.