LTCG-LOSS ON SALE OF EQUITY SHARES

GOOD DAY,

I have doubt in calculating LTCG of shares bought b4 2018.

Some equity shares that were bought before 2015 were sold during fy24-25. some of the shares incurred loss

cost price or cost of acquisition is unknown . unable to retriev from Dp. only FMV as on 31st jan 2018 is available.

in this scenario, how to calculate the profit or loss on sale.  do i need to consider only FMV and deduct from sale price??

While entereing the transsactions in ITR2, if FMV is more than sale price, its not displaying the actual loss amount. rather the loss is deducted upto the selling price .

only profit on sale of equity is fully displayed . Since the loss are not setting off against the profit, it leads to more CAPITAL GAIN and tax thereon

pls guide as how to show the loss incurred.

Thanks