Before updating a DLC pro, please take a moment to find out if we recommend 
actions, e.g. due to irreversible changes during the update.

The discussions below are ordered by the effected releases, i.e. the DLC pro 
Firmware before updating. To find out which firmware is installed on a DLC pro, 
e.g. go to the Home screen and access the Information screen, which lists the 
"Firmware Version". Please use this number to find and follow relevant notes 
before you update a DLC pro.

Updating from Firmware 1.8.1 or lower:
======================================
- For SHG and FHG systems: before updating from Release 1.8.1 or lower to Release 
  1.9.0 or higher please set the D parameter of slowPID to zero. If needed (lower 
  power or increased noise), repeat the optimization of the lock setting of the SHG 
  cavity and in case of a FHG the second doubling stage afterwards. To do this, 
  please follow the instructions for this routine but please do keep the D parameter 
  at zero throughout this procedure.
  (DLCPRO-4186)

Updating from Firmware 1.6.3 or lower:
======================================
- For SHG and FHG systems with AutoAlign: After reboot of the DLC pro controller, 
  AutoAlign Servos are set to the last saved value. This may result in insufficient 
  output power when updating the software from release DLC pro 1.6 or lower to release 
  DLC pro 1.7 or higher. To circumvent this problem, press the save button before 
  the software update.
  Additionally, please set the following parameters:
  laser1:nlo:power-optimization:stage1:autosave-actuator-values
  laser1:nlo:power-optimization:stage2:autosave-actuator-values
  laser1:nlo:power-optimization:stage3:autosave-actuator-values
  laser1:nlo:power-optimization:stage4:autosave-actuator-values
  laser1:nlo:power-optimization:stage5:autosave-actuator-values
  to true (requires maintenance user level) and execute laser1:save after the FW update. 
  In this way, the servo values are saved,  i.e. overwritten, after each successful 
  AutoAlign procedure.
  (DLCPRO-3430)

Updating from Firmware 1.4.0 or lower:
======================================
- For SHG Systems: When updating from Release 1.4 or lower to 1.5, the PID-gain 
  values of the SHG cavity lock are automatically changed such that the lock behavior 
  remains the same despite the adjustments while ensuring that their values represent 
  actual physical units. When updating directly from 1.0 or lower to 1.6 or higher the 
  scaling needs to be applied manually:
  - PID 1: P, I and D need to be divided by 8 while All needs to be divided by 16.
  - PID 2: P, I, D and All need to be divided by 8.
  When downgrading a SHG system from 1.5 or higher to 1.4 or lower, this scaling needs 
  to be reversed manually because this scaling is not un-done during the down-grade. 
  Either re-insert values manually (reverse the scaling above) or find the optimum 
  values as described in the manual. 
  (DLCPRO-2348) 
 
Updating from Release 1.3.2 or lower:
=====================================
- The sensitivity of the PID parameters of the frequency lock is corrected with  
  release 1.4.0 to match physical units. To ensure the same lock performance  
  after an upgrade from 1.3.2 or lower to 1.4.0 or higher increase "PID 1 Gain"  
  and "PID 2 Gain" by a factor of 10 each. 
  (DLCPRO-2343) 
 