s8 or s8+?
and how much? Is it new set or 2nd hand?

pay attention to the red-tint issue and also physical condition of the phone. Make sure no scuffs/scratches and no red-tint issue. If red-tint is present, depends on how obvious and whether you can accept it or not. I would suggest if you cant accept it, dont take it. If you find it good, then go ahead.

To answer your ques above:
1) go to the dialer, key in *#15987# and set the Reddish to 0.
2) next go to Settings > Display > Adaptive Display and check the RGB sliders, make sure all at MAXIMUM. and all the other sliders are in the Middle.
3) next under Display Settings as well, turn auto-brightness off and set the brightness to anything above 50%, or higher if you dealing under hot sun, etc. Basically just make sure the screen is bright that u can see colours and stuffs properly.
4) next go to dialer again, key in *#7353# and select TSP Dot Mode, it should show u a FULL white screen. Then proceed to check properly for any reddish tint on the white background.. Check the curved edges of the screen as well!
example of what a red-tint on white background look like:


Ok next steps will depend on whether you can accept the phone condition IF red-tint is present or not-present..
red tint Not present:
5) If no red-tint is present or you find the screen acceptable and to your liking, proceed to dialer and dial *#0*# and run ALL the tests available. This tests the hardware to make sure everything is working, the menus should be pretty self-explanatory and easy for u to understand..
6) check for any dead pixels under full Red/Green/Blue/White and Black background. For White it will be "receiver" for Black it will be "Vibration".
7) once done hardware check, exit and go back dialer and type *#06# to check the phone IMEI number, make sure it is the same as the STICKER which should come on the back of the phone.
8) next check the receipt, if it is indeed 2 years Samsung + 1 year senheng, the receipt date should show proof.
9) depending on your deal with the forummer, pre-order set comes with:
a) starter kit (wireless charger, TWO pieces of screen protector and phone case)
b) 5100 mah fast charge usb type-c powerbank
c) samsung protection plus.

if red tint PRESENT:
1) before doing steps 5-9 above, go to dialer and key *#15987# and set the Reddish to Level 1 (Reddish at -2 or -3) or Level 2 (Reddish at -4 or -6).

2) I suggest never set it to the last option Level 3 (Reddish at -6 or -9), cause that is too extreme and frankly if the device needs to be at level 3 (-6/-9) to hide the red-tint, its better off going to the bin.

3) I also suggest not touching the RGB sliders under Adaptive mode in Display settings to solve red-tint issue. As it may fuck the other colours balance up..
4) if adjusting the Reddish can solve the red-tint issue, then you are good to go to proceed steps 5-9 above.
5) if still reddish tint present, save yourself the trouble and kindly reject the forummer. Its COD after all, not CONFIRM buying. Thank the seller for his time, but kindly reject it. Its not the same as FFK-ing him.
6) make sure you are not rushed into closing the deal, take the necessary time do the necessary checks. The hype or excitement may get you to not check everything properly and I dont want you to regret anything later. As such, make sure you tell the seller you want to check everything properly so that he can allocate his time for your deal, and not be rushing for either party.

Good luck.

Red tint depends on luck. If the seller didnt mind u cancel the deal after the seal broken.  Then just reject if got red tint issue. Not 100% the odd that SC will do the 1 to 1 exchange..

Y no change on the spot?

He bought 2nd hand from a forumer iinm.

Scratch already and you still believe is new? It is very easier to seal back if only got transparent plastic wrap. Origin also got a sticker at open area where need to cut when open. I will immediate return as not worth getting a scratch unit even it might cheaper a bit.

I remember only S6 Edge time a lot out of the box scratch but this issue never happen in S7 and now S8 already.

Seal but scratch. Hmmm. But if u njoy it its all that matters

Try to use it without homepage. In chrome setting

how much did it cost you? just surveying the price. Cause now online sites like qoo100 and lazada can get s8 for 2.8k or s8+ for 3.2k. of course w/o any freebies and the samsung protection plus.. So just wondering how much did it cost you..

Anyway, did u check for red-tint like I suggested to you earlier?

that's worth it, its cheap. Means the seller sold it at a lost of RM200 hmm.

was a brand new set right? As in the tamper-sticker on the top right corner of the box wasn't cut yet when you bought it?

Mine is Samsung + Samsung  but got back feted bought at 4/5 but become 29/4

Check your warranty

Sms 62022 for digi and maxis.

Pc xxxxx

(Xxxx your imei) see is it registered?

Your phone imei not phone number press *#06#

Something's not quite right then, unless you are into some heavy gaming? I'm getting 4-5 hours SOT on my regular S8, but with no gaming, of course.

Let a few charging cycle. Battery still new.