All rates come from the upgrade page on BianKO's own website (https://www.bian-ko.eu/guide/upgrade). The "Upgrade Oranları" link in the site's left menu points somewhere else, so open that address directly. The page still carries the note "+8 High Class upgrade closed for the first 2 weeks". Columns show the base chance, the chance with a Trina and the coin cost per attempt.
Source / rights
Blessed Upgrade Scroll rates (+1 to +8)
The site labels the Blessed Upgrade Scroll "Higher Success Rate", and its table runs all the way to +8. The first two steps are a flat 100%. From +3 → +4 through +5 → +6 a Trina tops the chance up to 100%.
| Step | Chance | With Trina | Coins |
|---|---|---|---|
| +1 → +2 | 100% | 100% | 250,000 |
| +2 → +3 | 100% | 100% | 300,000 |
| +3 → +4 | 95% | 100% | 350,000 |
| +4 → +5 | 70% | 100% | 400,000 |
| +5 → +6 | 50% | 100% | 500,000 |
| +6 → +7 | 15% | 30% | 1,000,000 |
| +7 → +8 | 2% | 4% | 2,000,000 |
The real wall is +6 → +7 and +7 → +8. On those steps a Trina only doubles your odds: 30% instead of 15%, 4% instead of 2%. Every +8 attempt costs 2,000,000 coins.
Upgrade Scroll (low, middle and high class, up to +5)
The plain Upgrade Scroll "upgrades low, middle and high class items by up to 5 grades" with a "relatively low success rate". Each step costs the same 75,000 coins.
| Step | Chance | With Trina | Coins |
|---|---|---|---|
| +1 → +2 | 90% | 100% | 75,000 |
| +2 → +3 | 50% | 100% | 75,000 |
| +3 → +4 | 40% | 80% | 75,000 |
| +4 → +5 | 20% | 40% | 75,000 |
Upgrade Scroll (Low Class Item)
| Step | Chance | With Trina | Coins |
|---|---|---|---|
| +1 → +2 | 100% | 100% | 3,000 |
| +2 → +3 | 100% | 100% | 4,000 |
| +3 → +4 | 90% | 100% | 5,000 |
| +4 → +5 | 70% | 100% | 8,000 |
| +5 → +6 | 50% | 100% | 30,000 |
| +6 → +7 | 25% | 50% | 50,000 |
Upgrade Scroll (Middle Class Item)
The Middle Class scroll works on "Middle Class item and below". Its table even lists a +8 → +9 step, while the OASIS launch post caps gear at +8. The row is shown here exactly as the page lists it.
| Step | Chance | With Trina | Coins |
|---|---|---|---|
| +1 → +2 | 100% | 100% | 64,000 |
| +2 → +3 | 100% | 100% | 64,000 |
| +3 → +4 | 95% | 100% | 75,000 |
| +4 → +5 | 80% | 100% | 128,000 |
| +5 → +6 | 60% | 100% | 128,000 |
| +6 → +7 | 35% | 70% | 128,000 |
| +7 → +8 | 10% | 20% | 256,000 |
| +8 → +9 | 5% | 10% | 512,000 |
Accessory upgrades: Accessory Compound Scroll
Accessories use the Accessory Compound Scroll and cap at +3. The coin cost is in a different league: 100,000,000 coins just for +0 → +1.
| Step | Chance | With Trina | Coins |
|---|---|---|---|
| +0 → +1 | 55% | 82.5% | 100,000,000 |
| +1 → +2 | 50% | 75% | 200,000,000 |
| +2 → +3 | 50% | 75% | 300,000,000 |
Reverse Scroll rates
The Reverse Scroll "transforms high-level, unique items to reverse items". Every step costs 1,000,000 coins.
| Step | Chance | With Trina | Coins |
|---|---|---|---|
| +1 → +2 | 50% | 100% | 1,000,000 |
| +2 → +3 | 25% | 50% | 1,000,000 |
| +3 → +4 | 25% | 50% | 1,000,000 |
| +4 → +5 | 25% | 50% | 1,000,000 |
Where to get Trinas, Shadow Pieces and scrolls
Trinas are sold for AB in the Power Up Store. Scrolls come from mob drops and exchange boxes. Mob pages show no drop rates, and exchange percentages are the rates the site displays.
| Material | Source | Note |
|---|---|---|
| Trinas Piece | PUS (Only AB tab) | 60 AB; also in the basic drop of the Atross mob |
| Accessory Trinas Piece | PUS (Only AB tab) | 100 AB |
| Shadow Piece | PUS (Only AB tab) | 60 AB; doubles Shozin craft chances |
| Blessed Upgrade Scroll | Seven Sins mobs (Pride, Greed, Wrath...), Troll King, Snake Queen | Listed at 4.082% in the Random Item Exchange Gem |
| Upgrade Scroll | Abyss Gem, Bowl Mafia and Atross group drops | Listed at 11.169% in the Abyss Gem |
Quick upgrade tips
- Gear caps at +8 and accessories at +3 (OASIS launch post, April 2025).
- With a Blessed scroll, a Trina makes +3 through +6 a sure thing; a Trinas Piece is 60 AB in the PUS.
- The plain Upgrade Scroll is 50% on +2 → +3 and 100% with a Trina, so a Trina is close to mandatory there too.
- The cheapest accessory step is 100,000,000 coins. Gold is tuned to stay valuable on this server, so budget before you start.
FAQ
What is the max upgrade level on BianKO?
How much does a Trina help on +7 to +8?
When does +8 High Class upgrading open?
Which scroll upgrades accessories?
Related guides
- BianKO Power Up Store prices: every KC and AB item
- BianKO OASIS server info: level 83, +8 cap, client limit and features
- BianKO Spell Stone Powder: where it drops and how many each skill quest needs
- BianKO drop list: where each key item drops and which boss or mob gives it
- BianKO accessory upgrade rates: Accessory Compound chances and coin cost for +1 to +3
- BianKO FAQ: starting level, client limit, +8 upgrade chance and premium prices
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