Excess Depn Treatment Involving Equity

Good day!

Relatively new to Opentuition and grateful for the resources and support offered here.

With respect to F7 (Financial Reporting), understand any excess depreciation as a result of revaluation upwards requires a Dr Revaluation Reserve Cr Retained Earnings, in order to account for the reduced profit available to shareholders. Wondering what would the treatment be whereas for the below scenarios?

1) A revaluation downward instead of upward – do we account for “lower depn, higher profit” in our Equity accounts?

2) When it is solely a change in estimate useful life instead of revaluation (ref PPE depn video), do we also apply the same treatment, touching the Equity accounts to account for the “increased depn/ reduced profit”?

Greatly appreciate any advice! 🙂