Design Sprint for V.2 Revamp

Since our product team was hoping to get stakeholders actively involved in creating the solutions for optimal v.2 revamping results, we decided to give the Design Sprint Framework a try.
Day 1 - Note-n-Map & HMW
To kick off on Day 1, we started with mapping out our Understanding of the product target & target user needs by Asking the Experts to formulate further strategy.
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Note-n-Map is a technique for speeding up and simplifying the map-making on the first day of the sprint workshop.
Ask the Experts. We interviewed experts on our sprint team to ask about the vision, customer research, how things work, and previous efforts. A tip is to pretend like I am a reporter. Update long-term goal, questions, and map to proceed.

How Might We notes. Distribute whiteboard markers and sticky notes. Reframe problems as opportunities. Then stick all the How Might We notes onto a wall in any order. Move similar ideas next to one another. Label themes as they emerge. Then vote.
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Day 2 - Lightning Demo & Crazy Eights (Diverge & Ideate)
For Day Two, our main goal is to develop lots of solutions from the HMW problem statements from the previous day.
Lightning Demo. I sketched a thumbnails on the whiteboard to serve as a reminder to highlight other products that are similar, dissimilar, or even competitive to what was being explored in the Sprint.
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Crazy Eights. Now it's time for participants' turn to sketch out potential solutions, 8 per each Topic / HMW problem statement. And then let them pick 2 of their best sketches to do a more detailed sketch based on that.
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Day 3 - Sticky Decision & Business Canvas Model (Converge & Decide)
Sticky Decision. I followed these 5 steps to choose the strongest solutions from the final sketches of Day 2.
Art Museum (Tape sketches on the wall in a row).
Heat Map (Have each person review the sketches silently + 3 like votes stickers).
Speed Critique (3 mins per sketch. In groups, discuss the highlights of each solution).
Straw Poll (All at once, each person silently chooses a favourite idea).
SuperVote (Give the Decider three large dot stickers, will prototype those).
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Business Canvas Model. After a heated open discussion, operation team suggested that we may still need to narrow down further for our topics that will highly affect the key functions of our product. So we ended the sprint & started working on a business canvas model instead, to tackle the core issue of the product.
Even by the end of the Design Sprint, we could not come up with a solid solution to our core problems, but with the new issues that we brought up with the stakeholders, we had a clearer path of how should we reconstruct our backend structure.