Schewesser: financial asset investment impairment test, investment, available, carrying

Matori

Q: can equity security investment in financial asset ever be write up after write-down? either the stock investment is classified as for trading or available for sale, in GAAP or in IFRS?
This is related to Schewesser concept checkers for FRA test 5 on page 33. the answer allows write-up. My understanding is that for equity investment, no write-up is allowed to account the carrying value.
Thanks.