So.
https://na.op.gg/summoner/userName=NotNotkaiguy
I intentionally made the rank on this account and MMR wide ranges to test some promotion skips.
I used /remake to fail some of my placement games as that counts as a Loss but does not seem to impact MMR. Then during promos I would Dodge lobbys to fail them.
End result, I skipped ranks from B1 up to S1. About when it got 2-3 Divisions of a match average above what my rank was. I did end up playing and winning a promo series to hit gold as I was running out of time to grind my Main account and the act of Dodgeing and failing promos adds a really high amount of grind.
You have to win enough games to have your MMR set high enough the Rank plays catchup and skips.
https://na.op.gg/summoner/userName=kaiguy
Sat down and one tricked something I was doing well with for a few days to climb from G4 to P4. Did not skip a single series, only failed 1 attempt. So 4/5 series.
Now, I've heard rumor that you should dodge promos because supposedly they are rigged. Some say you can dodge and lose the game but not mmr.
There's no mathematical gains to Rigg promos, The very act is unreliable and damages the value of ratings. Predetermined games damage a predictive model's accuracy. Which then hurts the values you'd use to attempt to predetermine games.
If riot wanted to do something devious with promos, they can simple make it so your MMR value during promotions is treated as that Ranks Bare minimum value. That impacts how MM builds games and is going to be a constant factor 100%.
Personally, the idea promos are rigged is silly knowing it damages the value of ratings, plus from my personal experience generating a bias, and also because people climbing have won multiple ones prior to where they get stuck behave as if the prior promos don't count.
I Used to treat promos as important, I would "try harder" which meant playing even more aggressively then my usual playstyle.. That was not a good idea. How your consistently playing is what leads you to promos, adjusting your playstyle to something different is a mistake. My best advice is to just ignore promotional series completely and treat them like any other game. Long as your playing to win you will do well.
I can link you to a Player whos one of the more Vocal posters for threads along the lines of "OMG WTF RIGGED MM RIGED PROMOS STOP HATEING ON ME RITO!"
The guy just beat his Promos to make Gold 4. I don't know if its considered shaming or any other violation of the Code for me to provide that Posters account to you. but for some one who constantly complained about Promos the guy consistently has proven their ability to win them.
some say you can dodge and lose the game but not mmr.
Yes that's how it works.