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Chip PIC18F2420 Locked Content Unlocking starts from decapsulate the polysilicon package of the Microcontroller and then get access to its internal databus for the content extraction:

Bandgap voltage input for the ACs cannot be changed when used for both ACs simultaneously
ADC gain stage output range is limited to 2.4V
Sampled BOD in Active mode will cause noise when bandgap is used as reference
Bandgap measurement with the ADC is non-functional when VCC is below 2.7V

Chip PIC18F2420 Locked Content Unlocking

BOD will be enabled after any reset when read chip locked
Writing EEPROM or locked while unlocking any of them will not work
ADC has increased INL error for some operating conditions
DAC has increased INL or noise for some operating conditions
VCC voltage scaler for AC is non-linear

Maximum operating frequency below 1.76V is 8 MHz
Bandgap voltage input for the ACs cannot be changed when used for both ACs simultaneouslyIf the bandgap voltage is selected as input for one Analog Comparator (AC) and then selected/deselected as input for the another AC, the first comparator will be affected for up to 1 us and could potentially give a wrong comparison result.
Problem fix/Workaround

If the Bandgap is required for both ACs simultaneously, configure the input selection for both ACs before enabling any of them.

ADC gain stage output range is limited to 2.4 V

The amplified output of the ADC gain stage will never go above 2.4 V, hence the differential input will only give correct output when below 2.4 V/gain. For the available gain settings, this gives a differential input range of:
Problem fix/Workaround

Keep the amplified voltage output from the ADC gain stage below 2.4 V in order to get a correct result, or keep ADC voltage reference below 2.4 V.

Sampled BOD in Active mode will cause noise when bandgap is used as reference

Using the BOD in sampled mode when the device is running in Active or Idle mode will add noise on the bandgap reference for ADC, DAC and Analog Comparator.
Problem fix/Workaround

If the bandgap is used as reference for either the ADC, DAC and Analog Comparator, the BOD must not be set in sampled mode.

Bandgap measurement with the ADC is non-functional when VCC is below 2.7V
The ADC cannot be used to do bandgap measurements when VCC is below 2.7V.
Problem fix/Workaround

If internal voltages must be measured when VCC is below 2.7V, measure the internal 1.00V reference instead of the bandgap.
BOD will be enabled after any reset

If any reset source goes active, the BOD will be enabled and keep the device in reset if the VCC voltage is below the programmed BOD level. During Power-On Reset, reset will not be released until VCC is above the programmed BOD level even if the BOD is disabled.
Problem fix/Workaround
Do not set the BOD level higher than VCC even if the BOD is not used.