For those interested in getting the most out of their Nokia E52, here are some tips and tricks:
Early batches of the E52 (pre-091) suffered from the infamous (boot loop) or the "Sleep of Death" (phone would not wake up). The 091 003 production run was the hardware revision that shipped with Firmware v.032 or higher , which permanently resolved the power management IC (PMIC) soldering issues that plagued first-gen E52s.
This is the internal hardware identifier for the global version of the E52.