In retail, the pandemic resulted in more focused shopping experiences and growth in e-commerce, while at the same time, as cited by recent studies, 75% or more of consumer purchases broadly, are still happening in the physical store.
According to RBR, the self-checkout installed base will reach nearly 1.6 million terminals by 2026, almost tripling the global install base as of the end of 2020.
Our entry continues to exceed our original models, and our backlog increased approximately 19% versus the same period last year.
Revenue for the quarter was down 4% as a portion of revenue has shifted out to future quarters due to the temporary supply constraints and logistics challenges we're currently facing.
Our retail segments continue to perform well, with growth and revenue of 10% as compared to the third quarter of 2020.
Additionally, the DN Series is now live and fully certified in over 60 countries globally, contributing to our market expansion in the space.
We secured a contract for over $12 million with Banco Azteca in Mexico, including our DN Series cash recyclers, a new service contract and software licenses expanding across 500 branches.
With this win, over 75% of Banco Azteca's fleet is not composed of DN devices.
Approximately 200 branches and 40 off-premise locations will be equipped with a modern technology including our DN Series cash recyclers.
Lastly, we built a competitive win with Standard Chartered Bank Malaysia, upgrading all of their legacy vices to our DN Series, increasing our fleet to consist of 100% DN Series ATMs. We continue to see growth in demand for our AllConnect Data Engine with a number of connected ATMs, increasing approximately 23% sequentially in Q3 2021.
This is a significant milestone for us as more than 100,000 banking self-service devices are connected to this solution, which leverages real time Internet-of-Things connections from our deployed devices, and has consistently reduced customer downtime, by as much as 50%, resulting in greater than 99% uptime.
This win secures a strategic rollout of self-checkout devices, beginning with two stores before expanding to 300 stores in 13 countries and our eventual full rollout of 2500 stores in 15 countries over the span of two or three years.
This was a significant renewal totalling over $16 million for our systems and services, including point of sale, helpdesk support, software, and other solutions.
In Q3 in North America, we were awarded a large managed services agreement with a tier one financial institution, including a large order of DN Series ATMs. We continue to scale our debit and credit platforms, with our Vynamic Payments offering at a top 10 global bank cross more than 17,000 ATMs. As we continue to implement and scale our existing customers for our Payments Platform, our go-to-market team is growing a strong fire fighter [Phonetic] sales pipeline for 2022.
With our global network of 8000 experienced service technicians, and the similarities between ATMs and EV charging stations.
There are an estimated 1.5 to 2 million public charging stations even in the United States and Europe by 2025.
And this is an approximately an increase of over 200% from roughly 500,000 charging stations today split between about 300,000 in Europe, and 200,000 in the U.S.
Additionally, we included a solar panel system and out of 36 charging ports, for cars and e-bikes in parking areas.
As of today, our owners are 100% confirmed with customers committed to our products.
Additionally, in Q4 for our banking segments, we are starting this quarter with a backlog of approximately $205 million higher than the beginning of Q4 2020.
Specifically for America's banking, we're seeing over a 50% increase in our backlog as we enter the fourth quarter 2021 as compared to the same time last year.
Total revenue for the third quarter2021 was $958 million, a decrease over third quarter 2020 of approximately 4% as reported, a decrease of 5% excluding foreign currency benefit of $16 million and an $8 million impact from domestic businesses.
Adjusted for foreign currency and divestitures, product revenue decreased 3%, services revenue decreased 6% and software revenue increased 3% compared to Q3 2020.
During the quarter, approximately $90 million of revenue was delayed due to extended transport times and inbound technology component delays.
This primarily impacted the U.S., Latin America and certain APAC countries and reduced total revenue by approximately 900 basis points.
On a sequential basis, total revenue increased approximately 2%.
Non-GAAP gross profit for the third quarter was $263 million, or a decrease of approximately $22 million versus the prior year period on lower gross margins of 27.4%.
The deferral of revenue and non-billable inflation resulted in a reduction to third quarter gross margin of approximately $33 million.
Service margins increased 40 basis points versus the prior period and more in line with our expectations.
Product gross margins were down approximately 180 basis points versus the prior year period, primarily due to $10 million as a result of inflationary pressures and supply chain logistics, partially offset by a favorable DN Series versus legacy ATM and geographic customer mix.
Software gross margins declined 500 basis points versus the prior year period excluding the impact of a prior year prayer cost benefit of approximately $5 million that did not recur in 2021.
Software gross margins were down approximately 40 basis points due to unfavorable mix.
Operating expense of $182 million for the quarter decreased approximately $14 million versus the prior period, period and decreased $17 million sequentially.
The net result was an operating profit of $81 million and operating margin of 8.5% in the quarter, the same trends drove adjusted EBITDA of $103 million and adjusted EBITDA margin of 10.7% in the quarter.
Eurasia group banking revenue of $323 million decreased approximately 11% versus the prior period and 12% after adjusting for foreign currency benefit of $7 million and a $3 million impact of divestitures.
As expected, following a strong order entry in Q2 and several non-recurring liabilities in the prior year, segment product order growth decreased 35%.
Gross profit for the segment decreased to $98 million year-over-year included favorable foreign currency balances of $4 million and an unfavorable divestiture impact of $1 million.
Gross margin at 30.3% was down 50 basis points, the decrease was primarily due to inflationary pressures, offset by our focus on cost management.
Americas banking revenue decreased $22 million, or approximately 6% to $347 million, primarily due to declines in software and services revenue due to the negative collateral impact of unfavorable geographic mix of installations from North America to Latin American.
Segment gross profit of $86 million was down $17 million due to lower revenues.
Retail revenue of $288 million increased 10% year-over-year as we reported an 8% after adjusting for $6 million currency benefit and investor headwind of $2 million.
Demand for our point-of-sale checkout -- self-checkout continued to increase versus the prior year period with proprietary growth of approximately 23%.
Retail gross profit increased 15% at $79 million driven by revenue growth, gross margin expanded by 110 basis points directly attributable to growth in self-checkout revenue.
This business is less than 2% of our total annual retail revenues in order was a strategic fit for the second going forward.
Unlevered free cash flow used in the quarter increase $121 million versus the prior year primarily due to increases in inventory, which are necessary to support both Q4 production and delivery targets as well as increases in critical components for 2022 orders.
Company ended the quarter with $325 million of total liquidity, including $230 of cash and short term investments.
At the end of the quarter, the company's leverage ratio was 5.4 times, which continues to be below our covenant maximum of six times.
We are revising our revenue range to $3.9 million to $3.95 billion, which reflects approximately $140 million in revenue deferral from 2021 to 2022 due to the current supply chain challenges.
Accordingly, we are revising our adjusted EBITDA outlook by approximately $40 million to a range of $415 million to $435 million taking into account the gross margin associated with the aforementioned revenue deferral and an incremental $20 million for supply chain related inflation over previous estimates.
The total estimated impact on supply chain related inflation is now approximately $45 million.
Our free cash flow outlook is now $80 million to $100 million, reflecting our revised EBITDA outlook and the net incremental working capital timing impact of the revenue deferred.

Summary:
This business is less than 2% of our total annual retail revenues in order was a strategic fit for the second going forward.
We are revising our revenue range to $3.9 million to $3.95 billion, which reflects approximately $140 million in revenue deferral from 2021 to 2022 due to the current supply chain challenges.
Accordingly, we are revising our adjusted EBITDA outlook by approximately $40 million to a range of $415 million to $435 million taking into account the gross margin associated with the aforementioned revenue deferral and an incremental $20 million for supply chain related inflation over previous estimates.